Instrument and Equipment Records, 1892-1970

(Bulk 1905-1945)

 

 

 

 

 

 

Carnegie Institution of Washington

Department of Terrestrial Magnetism Archives

Washington, DC

 

 

 

 

 

 

 

 

 

 

 

Finding aid written by:

Ann Mulfort

June, 2005

 

 


Instrument and Equipment Records, 1892-1970

(Bulk 1905-1945)

 

 

 

Table of Contents

 

 

Page

Introduction

1

Administrative History

1

Scope and Content Note

2

Folder Listing

4

Subject Terms

25

Related Collections

25

 


Instrument and Equipment Records, 1892-1970

(Bulk 1905-1945)

DTM-2005-08

 

Introduction

Abstract: This collection contains technical documentation, inventory records, and correspondence regarding the instruments and equipment created, purchased, tested, or used by the Department of Terrestrial Magnetism (DTM) at the Carnegie Institution of Washington (CIW). Although the department was formed in 1904, the dates of the records span 1892-1970.

Extent: 23 linear feet; 9 records center cartons, 11 shoeboxes, 15 map folders.

Acquisition: The records have been in the possession of the Department of Terrestrial Magnetism (DTM) since their creation.

 

Access Restrictions: There are no access restrictions to this collection. Material within this collection stamped as confidential, restricted or secret is no longer classified.

 

Copyright: Copyright is held by the Department of Terrestrial Magnetism, Carnegie Institution of Washington. For permission to reproduce or publish, please contact the archivist at the Department of Terrestrial Magnetism.

 

Preferred Citation: Instrument and Equipment Records, 1892-1970, Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, D.C.

 

Processing: This collection was processed by Ann Mulfort in June 2005 through the generous support of the National Historical Publications and Records Commission.

 

Administrative History

The Department of Terrestrial Magnetism (DTM) of the Carnegie Institution of Washington (CIW) was established in 1904 to study the earth�s magnetic field. To achieve this, magnetic measurements were taken around the world at survey stations and observatories on land, as well as on oceanic expeditions. As the department developed, other fields of study were investigated. They have included the earth�s ionosphere, atmospheric electricity, nuclear physics, isotope geology, seismology, astronomy, and biophysics. During World War II, DTM was especially occupied with defense work, including the development of the proximity fuze, in addition to other projects that supported the war effort.

 

To support these expeditions and the department�s diverse fields of study, specialized instruments and apparatus were required. Integral to DTM�s history were the gifted engineers and instrument-makers who designed and constructed equipment to facilitate the work of the scientists in their distinct studies. Not only were instruments created by DTM personnel, but �GFMs� (government furnished material) were utilized to accomplish the goals of the department.

 

 

Scope and Content Note

This collection contains technical documentation, inventories, and correspondence detailing the specialized instrumentation and equipment needed to support the wide-ranging research conducted by DTM for nearly 80 years. The materials include equipment specifications, instrument drawings, constants, and standardization tests that provide the researcher with a broad survey of the history, complexity and enormity of instrumentation used for geophysical research in the twentieth century.

 

Arrangement

This collection is arranged in three series, following the format of the materials. The majority of the files are arranged alphabetically, with the exception of the national defense materials, which are maintained in the order received by Archives.

Series 1. Cahiers, 1905-1943

Series 2. Card files, 1905-1968

            Series 2, Subseries 1: Carnegie (Ship) Inventory Cards, 1909-1929

            Series 2, Subseries 2: Department Inventory Cards, 1905-1968

            Series 2, Subseries 3: National Defense Inventory Cards, 1940-1947

Series 3. Technical Documentation and Correspondence, 1892-1970, n.d.

                        Series 3, Subseries 1: General Technical Documentation and Correspondence,

1892-1970, n.d.

                        Series 3, Subseries 2: National Defense Technical Documentation and

Correspondence, 1943-1949

 

Series 1: Cahiers, 1905-1943

This series contains laboratory notebooks which document the technical parameters and intercomparison test results of geomagnetic instruments. Because of the bulk of materials in this series, they were heavily weeded. A representative sample of each major category of instrument used at DTM was retained. Five extant instruments used at DTM which are represented in this series can be found at the following institutions:

            National Museum of American History; Smithsonian Institution, Washington, DC:

Earth Inductor No. 3

Magnetometer No. 8

Universal Magnetometer No. 21

Fredericksburg Magnetic Observatory; U.S. Geological Survey, Corbin, VA:

Deflector No. 4

Dip Circle No. 202

There are also miscellaneous cahiers that include memoranda, summaries of tests, special observations.

 

Series 2: Card files, 1905-1968

The materials in this series are index card inventories of instruments and equipment used in the management of DTM�s scientific research, and are arranged in three subseries.

 

Series 2, Subseries 1: Carnegie (Ship) Inventory Cards, 1909-1929

These materials include an index card system which documents the existence of instruments and equipment used on the ship Carnegie in its mission to gather data on the earth�s magnetic field. The cards are organized into four groups; an alphabetical listing, followed by Captain James Percy Ault�s alphabetical listing of equipment, followed by an alphabetical listing of items loaned by the ship. The materials end with a miscellaneous group of cards, presumably not yet filed by the property clerk.

 

Series 2, Subseries 2: Department Inventory Cards, 1905-1968

This subseries contains index cards of instruments and equipment used by DTM, filed alphabetically. Items include absorption boxes, books, foghorns, magnetometers, non-magnetic tents, potentiometers, and much more. The cards contain the date and place of creation, cost, and other specifications. Some include more details regarding the dates and locations of loans or transfers to other posts, as well as information regarding the history of the item�s usage, and whether or not the item was expended.

 

Series 2, Subseries 3: National Defense Inventory Cards, 1940-1947

The index cards in this subseries include instruments and equipment used by DTM in its government defense contract work during and after World War II. The cards contain the date and place of creation, cost, and other specifications. Many include more details regarding the dates and locations of the transfer to other assigned posts, information on the history of the item�s usage, and whether or not the item was expended. The records are presumably arranged by a special coding mechanism based on locations, contract numbers and a lettering scheme. They remain in the order which they were received by the archives. Please see the list of codes at the end of this finding aid for a key to the meanings of some of the codes in this subseries.

 

Series 3: Technical Documentation and Correspondence, 1892-1970, n.d.

This series contains correspondence; technical drawings and schematics; National Bureau of Standards and DTM�s tests and measurements; shipment orders; and inventory listings of instruments and equipment used by DTM for nearly 80 years. This series is arranged into two subseries.

 

Series 3, Subseries 1: General Technical Documentation and Correspondence, 1892-1970, n.d.

The files in this subseries are arranged alphabetically and include correspondence regarding the instruments and equipment used by DTM, documentation of tests and measurements of DTM�s and others� equipment. Also included are instructions for using the equipment; operating manuals; instructions for magnetic, atmospheric electric, auroral, and ionospheric observers; as well as instructions for field surveys. Due to the bulk of documentation on magnetometers, they are organized numerically, beginning with the DTM-owned first; followed by magnetometers owned by other organizations. The potentiometers are arranged in numeric order only.

 

Series 3, Subseries 2: National Defense Technical Documentation and Correspondence, 1943-1949

This subseries contains listings and descriptions of government furnished and DTM created equipment; memos; inspection reports; correspondence; War Department manuals; transfers of accountability for instruments; and equipment for government related contracts that DTM completed during and immediately following World War II, including the operation of ionospheric stations. The records are presumably arranged by a special coding mechanism based on locations, contract numbers and a lettering scheme. They remain in the order which they were received by the archives. Please see the list of codes at the end of this finding aid for a key to the meanings of some of the codes in this subseries.

Folder Listing

 

Box

Folder

Series 1: Cahiers, 1905-1943

 

 

Deflector No. 4 Constants, 1911-1916

1

 

Dip Circle No. 202 Constants, 1909-1919

 

 

Earth Inductor No. 3 Constants and Comparisons, 1912-1923

 

 

Experimental Work; Ship�s Instruments, 1905-1911

 

 

[Magnetograph No. 5 Declinations and Comparisons; loose materials], 1933-1940

 

 

Magnetometer No. 1 Constants, 1906-1908

 

 

Magnetometer No. 8 Constants and Standardizations, 1908-1939

 

 

Magnetometer No. 26 Constants and Standardizations, 1912-1934

 

 

Marine Collimating Compass No. 1, 1908-1928

 

 

Miscellaneous No. 1 Miscellaneous Instrumental Tests, 1906-1922

 

 

Miscellaneous No. 2 Memoranda regarding tests for impurities, 1907-1909

 

 

Miscellaneous No. 3 Approximate disturbing effects due to iron and steel aboard the Carnegie (Ship), 1908-1909

 

 

Miscellaneous No. 4 Compilations and summaries of watch tests, 1911-1913

 

 

Miscellaneous No. 5 Induction-coefficient determinations Magnetometer 3 to 15, 1908-1919

 

 

Miscellaneous No. 6 Azimuth determinations, 1916-1935

 

 

Miscellaneous No. 7 Calibrations by department of weights, lever comparator, and length measures, 1912-1916

 

 

Miscellaneous No. 8 Discussions and formulae relating to determination of distribution coefficients [Magnetometer No. 3], 1915-1921

 

 

Miscellaneous No. 9 Station-Difference Compilations, 1908-1922

 

 

Miscellaneous No. 10 Practice Observations, 1916-1924

 

 

Miscellaneous No. 11 Magnetograph No. 1, 1916

 

 

Miscellaneous No. 12 Magnetograph No. 2, 1916-1917

 

 

Miscellaneous No. 13 Tests of dip needles to be sent to field parties, 1917-1920

 

 

Miscellaneous No. 14 Telescope No. 9; Theod. [Theodolite] No. 13, 1917

 

 

Miscellaneous No. 15 C.D.C. 203, 1917

 

 

Miscellaneous No. 16 T.M. Compass � Variometer No. 2 Dip Circle 241, 1919

 

 

Miscellaneous No. 17 T.M. Compass � Variometer No. 2, 1919

 

 

Miscellaneous No. 18 Memoranda regarding local disturbances in Main Building, 1919

 

 

Miscellaneous No. 19 Ebert Double Compass, 1917

 

 

Miscellaneous No. 20 Richard Statoscope No. 85574, 1921

 

 

Miscellaneous No. 21 Mag.-E.I. [Magnetometer-Earth Inductor] Nos. 24 and 26, 1920

 

 

Miscellaneous No. 22 Deflector minus standard values for Carnegie (Ship) instruments, Cruise VI, 1922

 

 

 

 

 

Miscellaneous No. 23 Discussion regarding instructions for diurnal-variation observations, 1922

 

 

Miscellaneous No. 25 Magnetograph No. 5, 1921-1923

 

 

Miscellaneous No. 26 Experimental apparatus, 1917

 

 

Miscellaneous No. 27 Magnetograph No. 3, 1924

 

 

Miscellaneous No. 28 Determination of magnetic moments, 1926-1928

 

 

Miscellaneous No. 29 Determination of coefficient of recombination for gaseous ions, 1916-1918

 

 

Miscellaneous No. 30 Special observations for scale value Chronometer No. 50098, 1924

 

 

Miscellaneous No. 31 Station Em, 1927

 

 

Miscellaneous No. 32 Station O Azimuth observations, 1928

 

 

Miscellaneous No. 33 Theodolite Berger No. 3578, 1914-1941

 

 

Miscellaneous No. 34 Ritchie compass, 1931

 

 

Miscellaneous No. 35 Gyroscopic Octant computations, 1907

 

 

Sine-Galvanometer No. 1 Experimental work and comparisons, 1921-1943

2

 

T.M. Compass-Variometers, 1918-1919

 

 

Universal Magnetometer No. 21, 1912-1939

 

 

[Variometer No. 5, Earth Inductor No. 48; loose materials], 1940

 

 

 

 

 

Series 2: Card files, 1905-1968

 

 

Series 2, Subseries 1: Carnegie (Ship) Inventory Cards, 1909-1929

 

 

Carnegie (Ship) Inventory Cards

10

 

 

 

 

Series 2, Subseries 2: Department Inventory Cards, 1905-1968

 

 

Absorption boxes to Bookstand

11

 

Booms to Fluxometer

12

 

Foghorn to Pliers

13

 

Pliotron to Tent; non-magnetic

14

 

Terminals to Steel yard

15

 

Cards �To be filed�

16

 

 

 

 

Series 2, Subseries 3: National Defense Inventory Cards, 1940-1947

 

 

NOrd, NXs-W, DTM-ND, ND-AE, ND-WF, ND-EB-2, NOas, NObs,

ND-S, NDO, NDC-M, NDU, NDA, 1942-1947

17

 

NSC-B, 1943-1946

18

 

Transferred or Expended Equipment [1 of 2], 1940-1944

19

 

Transferred or Expended Equipment [2 of 2], 1940-1944

20

 

 

 

 

Series 3: Correspondence, 1892-1970, n.d.

 

 

Series 3, Subseries 1: General Correspondence and Drawings, 1892-1970, n.d.

Accelerom[e]ter, Three-component, 1938

2

1

Accutrons, 1960, 1965

 

2

Air-compressor, Ingersoll-Rand, 1937

 

3

Air-compressor, Worthington, 1937, 1939

 

4

Air conditioner, Carrier � Room 308, n.d.

 

5

Air conditioner, General Electric, Type AF-1, 1938

 

6

Ammeter, Weston Standard D.C. � no. 1305, 1921-1922

 

7

Amplifier (Direct-Current) Type 715-A Form 517-F; Gen�l [General] Radio Co., n.d.

 

8

Amplifier, photoelectric cell, a.c., 1935

 

9

Anemographs, Friez (Dept. [Department] nos. [numbers] 1 & 2) Model 450, 1924-1945

 

10

Anemometer (Davis) no. 161, 1932

 

11

Anemometer Davis 5� no. 204, 1915, 1919

 

12

Anemometer DTM no. 5, 1929

 

13

Anemometer (Rosenm�ller) no. 19188, 1931, 1935

 

14

Anemometer Serial no. 13B-1191, 1931

 

15

Anemometer Serial no. 13B-1286, 1931

 

16

Anemometer, Tycos Biram�s (DTM no. 4), 1928

 

17

Anemometers: nos. 18425, 18780, and 18781, 1930-1931

 

18

Aneroid Barometer, 1908, 1918

 

19

Aneroid Barometer no. 10, 1921

 

20

Aneroid Barometer no. 11, 1921, 1926

 

21

Aneroid Barometer, Weule (W.B. no. 7274), 1922

 

22

Askanias, 1964

 

23

Assorted Atmospheric Electricity schematics, 1915, 1923, 1927, 1929-1930, 1934-1935, 1937, n.d.

Map Case 1

1

Atmospheric-Electric Observatory on Deck, 1917-1919

2

24

Atmospheric Electricity instruments, 1914-1925

 

25

Atmospherics Recorder � Watheroo, 1934-1936

 

26

Aurora instructions and constants (File no. 1), 1926-1929

 

27

Auroral instructions and constants (file no. 2), 1930, 1941

 

28

Auroral instructions, I.P.Y. [International Polar Year], 1932

 

29

Auroral photometer and spectroscope, 1941

 

30

Auroral symbols, 1932

 

31

Autoclave, n.d.

 

32

Azimuth sights � �Husun� no. 50, 1921

 

33

Azimuths of marks at stations, 1909-1918

 

34

Bar, stainless steel, NBS 4981, 1941

 

35

Barometer 3948 (Green), 1919, 1922, 1928

 

36

Barometer 4177 (Green), 1919, 1922, 1928

 

37

Barometer, Aneroid (DTM no. 8), 1926-1927

 

38

Barometer corrections, Watheroo, 1932

 

39

Barometer, mountain (H.J. Green no. 5666), 1923

 

40

Barometer, Wall (no. 1650), n.d.

 

41

Becker�s Balance no. 2170, 1907-1909, 1913-1916

 

42

Binnacle, deflector, 1922

 

43

Binnacle, standard compass, 1922

 

44

Boiler, no. 11515, 1940-1941

 

45

Borrowed equipment, 1941-1951, 1958

 

46

Borrowed equipment, World War II, 1940, 1946-1951

 

47

Bridge, Impedance model 1b-1b, 1952

 

48

Bridge, Kohlrausch slide wire (L. & N. [Leeds & Northrup] no. 135158), n.d.

 

49

Bridge, Radio-Frequency, Type 916-A, n.d.

 

50

Bridge � VHF model 803A, Ser. [Serial number] 1333, n.d.

 

51

Bridge no. 522, Wheatstone � Kirchoff, 1913-1917

 

52

Bruning Model 300 Copyflex, 1965-1966

 

53

Brush Development, 1946-1947

 

54

Calculating machine, Mercedes, n.d.

 

55

Calculator, Frid�n, 1939

 

56

Calculator printing, Remington Rand, n.d.

 

57

Calibrating-Condensers, 1931

 

58

Camera no. 25, 1926-1927

 

59

Camera, Panoram 4 (Case no. 7791), 1918

 

60

Camera (Sept still and movie camera), n.d.

 

61

Camera, Shop lens no. 2187623, 1920

 

62

Cameras (Leitz), 1931-1932

 

63

Carbo-Freezer (Serial no. F-873), 1930

 

64

Cathode-ray oscillograph Type 303, 1952

 

65

Cathode-ray oscillograph type TMV-122-B, 1935

 

66

Cathode Ray Tube 21ACP4, 1953

 

67

Cathode Ray Tube 21ARP4, 1953

 

68

Cell, Standard (Weston nos. 2891, 2892, 4466, 4829, 4830, 4960), 1913, 1923

 

69

Cell, Standard (Weston nos. 6491, 6500, 7590), 1927-1935

 

70

Cells, Eppley Standard Serial nos. 392016 and 395735, 1947

 

71

Challenge Eyelet Press no. G-9579, n.d.

 

72

Challenge Eyelet Press (Serial no. E2309), 1926

 

73

Chronometer, Marine 48721, 1914

 

74

Chronometer, Marine Dent nos. 52917, 52918, 53157, 53862, 58151, 1904-1920

 

75

Chronometer, Marine Kittel nos. 254, 264, 270, 1903-1909

 

76

Chronometer, Marine Wikins no. 2761, 1909

 

77

Chronometer Negus 1809 (Marine � Property W.J. Peters), 1909

 

78

Chronometer, pocket Ditisheim nos. 50088, 50097-50102, 50107, 50109-50110, 1915-1922

 

79

Chronometer, pocket Kittel nos. 226, 231, 241, 244, 251-254, 256-258, 269, 1905-1909

 

80

Chronometer, pocket Nardin no. 13733, 1909

 

81

Chronometer, Parkinson & Frodsharn no. 1128, 1922

 

82

Chronometers � General, n.d.

 

83

Clothing requirements, etc. Huancayo Magnetic Obs�y [Observatory], 1926, 1929

 

84

Collectors, Radioactive construction, 1918, 1925, n.d.

 

85

College � Fairbanks (I.P.Y.) [International Polar Year] Station, 1932

 

86

Collimating Compass, Marine no. 1, 1908-1928

 

87

Collimator 2 (made by Gaertner), 1920

3

1

Comparator, M1160J, Serial no. 1264, 1941

 

2

Compass attachment 1 (Ritchie) Experimental liquid, 1917

 

3

Compass-Declinometer, C. & G.S. [Coast & Geodetic Survey] nos. 6,7,8, and 9, 1944

 

4

Compass-Declinometer, C. and G.S. no. 11, 1943

 

5

Compass-Variometer, T.M. no. 1, 1918, 1926, 1928

 

6

Compass-Variometer, T.M. no. 2, 1917-1927

 

7

Compass-Variometer, T.M. no. 3, 1919

 

8

Compass-Variometer, T.M. no. 4, and Inertia Gimbal mounting, 1919

 

9

Compensated Earth Inductor, 1917

Map Case 1

2

Compressor, Model NX1 Non-lubricated Serial N2628, 1947, 1952

3

10

Compressors and Vacuum pumps Model N (5� X 1¼� stroke), 1947

 

11

Condenser no. 1, after Harms, 1907

 

12

Condenser no. 1693, 1903

 

13

Condenser, D.T.M.C.I.W. no. 4 after Gerdien (Manufactured by D.T.M.C.I.W.), 1916-1921

 

14

Condenser, Gerdien�s variable, D.T.M.C.I.W. no. 2, 1914-1923, 1948

 

15

Condenser, Leybold�s Nachfolder (Serial no. 108), 1948

 

16

Condensers 2, 4, and 5 (Gerdien), 1916-1924, 1946

 

17

Condensers � Cond. � App. �B� 7BX, 7AX, 8A, 1931

 

18

Condensers, Mica Serial nos. 2306A, 2811, 2844, 2866, 2890, 2960, 3004, 3033, 1947

 

19

Conductivity apparatus, 1924-1932

 

20

Conductivity apparatus, D.T.M.C.I.W no. 2 after Gerdien, 1905-1910

 

21

Conductivity apparatus, D.T.M.C.I.W no. 2 Gerdien with electroscope, 1906-1919

 

22

Conductivity apparatus no. 3, (see also Electroscope 18), 1919-1920, 1930

 

23

Conductivity apparatus D.T.M.C.I.W no. 4, 1918-1919

 

24

Conductivity apparatus no. 6, 1921-1937

 

25

Conductivity apparatus no. 7, 1925-1941

 

26

Conductivity apparatus 8A, Carnegie (Ship) recording, 1929

 

27

Conductivity apparatus 8A & 8B (Obs�y type) installed at Tucson Obs�y., 1929-1934

 

28

Conductivity apparatus, Stratosphere, 1935

 

29

Constant speed apparatus, Leeds & Northrup, 1926

 

30

Constants L.C.D.C. 35 (U.S.C. & G.S.) Dover 168, 1905-1909

 

31

Converter, Rotary (Wagner no. 95102), 1914

 

32

Cooler, circulating 4-86LA, 1951-1952

 

33

Cosmic-Ray apparatus (A.H. Compton�s), 1932-1933

 

34

Cosmic-Ray meter, Model C, 1928, 1935-1943

 

35

Counting-Rate meter Type 1500-B, n.d.

 

36

Couplings, Francke Flexible, 1928

 

37

Crystal clocks � Toyo, 1940, 1962-1963

 

38

Crystal detector, n.d.

 

39

Declinometer schematics, n.d.

Map Case 1

3

Deflector no. 1, 1906

3

40

Deflector no. 2, 1907

 

41

Deflector no. 3, 1909-1911, 1914-1917

 

42

Deflector no. 4, 1911, 1913-1918, 1923

 

43

Deflector no. 5, 1916-1917, 1919, 1928

 

44

Deflector compass schematics, 1908

Map Case 1

4

Delco-Light Outfit no. 1266 (Serial no. 115056 HMO), 1922-1927, 1934

3

45

Delco-Light service manual and mechanical manual, n.d.

 

46

Depth-Finder, Sonic (Property U.S. Navy), 1928

 

47

Depth recorder, Barr & Stroud, 1928

 

48

Detector, VHF, model 417A, Serial 634 and above, n.d.

 

49

Diesel engine and generator, Witte VD-11, 1942-1943

 

50

Dip Circle no. 8 (Topographical surveys, Dept. of the Interior, Dominion of Canada no. T.S. 61), 1922

 

51

Dip Circle no. 9 (J.C. Beattie), 1910-1911

 

52

Dip Circle no. 18 (Property of Coast and Geodetic Survey), 1911

 

53

Dip Circle nos. 20 and 33 (Property of Zi-ka-wei Observatory), 1907, 1911

 

54

Dip Circle nos. 23, 31, 34, and 36 (Property of U.S.C. and G.S.), 1906-1907, 1911, 1918-1920

 

55

Dip Circle Barrow no. 38, 1916, 1918, 1920

 

56

Dip Circle Barrow no. 41 (Property Melbourne Observatory), 1911, 1914

 

57

Dip Circle T.S. no. 61, 1922

 

58

Dip Circle no. 71 (Property of Hong Kong Observatory), 1911, 1913

 

59

Dip Circle no. 122 (Massachusetts Institute of Technology � Dover), 1907

 

60

Dip Circle no. 126, 1913

 

61

Dip Circle no. 127 (Property of U.S. Navy), 1905, 1933

 

62

Dip Circle no. 142 (J.C. Beattie), 1911

 

63

Dip Circle no. 154 (Dover), 1922

 

64

Dip Circle no. 163 (Lloyd Creak) (U.S.C. and G.S.), n.d.

 

65

Dip Circle no. 169 (Dover), 1904-1919

 

66

Dip Circle no. 171 (Dover), 1905-1912

 

67

Dip Circle no. 172 (Dover), 1907-1917

 

68

Dip Circle no. 177 (Dover), 1905-1922

 

69

Dip Circle no. 178 (Dover), 1905-1913

 

70

Dip Circle no. 189 (Dover), 1906-1928

 

71

Dip Circle no. 201 (Dover), 1909-1919

 

72

Dip Circle no. 202 (Dover), 1909-1919

 

73

Dip Circle no. 203 (Lloyd Creak pattern), 1908-1918

 

74

Dip Circle no. 204 (Dover), 1909-1917

 

75

Dip Circle no. 205 (Dover), 1909-1928

 

76

Dip Circle no. 206 (Dover), 1909-1919

 

77

Dip Circle no. 222 (Dover), 1911-1918, 1933-1943

 

78

Dip Circle no. 223, 1911-1922

 

79

Dip Circle no. 226, 1918-1920, 1942

 

80

Dip Circle no. 240 (Dover), 1919

 

81

Dip Circle no. 241, 1915-1916, 1921-1928, 1931-1941

 

82

Dip Circle no. 242 (Dover), 1915, 1918-1928, 1931-1941

 

83

Dip Circle no. 4655 (Property U.S.C. and G. Survey), 1914

 

84

Dip Measurer no. 1 (C. and G.S.) [Zeiss no. 4031), 1915

 

85

Dip Measurer no. 5490, 1915

 

86

Dip needles 1X to 18X (Dover), 1914, 1916-1917

 

87

Disc Gages and End Standards (Accepted lengths at different temperatures), 1916

 

88

Dispersion apparatus no. 1394 after Elster and Geitel with electroscopes nos. 1416 and 1417 and dry pile 1408, n.d.

 

89

Ditto, n.d.

 

90

Diurnal variation, Field observations for, 1938-1939

 

91

Dividing engine, 1911-1912

 

92

Dosimeters, NO: 6185-6071, KK109; 135, 1949-1950, 1952

 

93

Dust-Counter-Aitken (No number-on loan from the Commonwealth Bureau, Melbourne, Australia), 1931-1933, 1939

 

94

Dust-Counter (Aitken) DTM nos. 1-7, 1929-1934

 

95

Dust-Counter (Casella no. 107), 1925

 

96

Dust-Counter � General, 1927-1934

 

97

Dust-Counter memoranda, Aitken, 1928-1931, 1938

 

98

Earth Current apparatus (College, Alaska and Chesterfield Inlet, Canada), 1932, 1942

 

99

Earth-Current apparatus at Tucson Magnetic Observatory,1931

4

1

Earth-Current apparatus for use at polar stations, 1932

 

2

Earth-Current installation (proposed) at the Cheltenham Magnetic Observatory, 1933

 

3

Earth-Current observations suggested for International Polar Year 1932-1933, 1930

 

4

Earth-Current recorder � Leeds & Northrup instruction books and price lists, 1922-1923

 

5

Earth-Current recorder and lines � Huancayo Observatory (L & N recorder 95801) Part 1, 1925-1926

 

6

Earth-Current recorder and lines � Huancayo Observatory (L & N recorder 95801) Part 2, 1926

 

7

Earth-Current recorder and lines � Huancayo Observatory (L & N recorder 95801) Part 3, 1926-1932

 

8

Earth-Current recorder and lines � Watheroo Observatory (L & N recorder 80634) Part 1, 1922-1925, 1932-1933

 

9

Earth-Current recorder and lines � Watheroo Observatory (L & N recorder 80634) Part 2, 1924-1929

 

10

Earth Inductor no. 2, 1910, 1914, 1916, 1924-1925

 

11

Earth Inductor no. 3 and Marine Galvanometer, 1912-1922

 

12

Earth Inductor no. 4 and Galvanometer no. 20883, 1913, 1930

 

13

Earth Inductor no. 5, 1916-1925, 1930-1931

 

14

Earth Inductor no. 6 and 6A, 1910-1912, 1922, 1942

 

15

Earth Inductor no. 7, 1928

 

16

Earth Inductor no. 7 (Marine type), 1919-1922, 1928-1929

 

17

Earth Inductor no. 16, 1931

 

18

Earth Inductor no. 48 and Galvanometer no. 206 (Plath), 1907-1924, 1936, 1940-1942

 

19

Earth Inductor no. 171, 1932-1934, 1942

 

20

Earth Inductor � Adaptation to marine measurements of horizontal intensity, 1928

 

21

Earth Inductor Compass, 1921-1922

 

22

Earth Inductor methods, 1931-1932

 

23

Earth Inductor, Schulze (Apia Observatory no. 2), 1928, 1934, 1939, 1945

 

24

Earth-Resistivity apparatus, 1924-1928

 

25

Earth-Resistivity apparatus, Earth-Current Graphs, etc., 1922, 1931-1932, n.d.

Map Case 1

5

Earth-Resistivity apparatus, Gish-Rooney, n.d.

4

26

Earth-Resistivity memos, 1926

 

27

Earth-Resistivity meter, Bureau of Mines, 1930

 

28

Earth-Resistivity methods and equipment, 1928

 

29

Electric plant, Universal, 1936

 

30

Electrometer no. 20 (Bifilar), 1949

 

31

Electrometer nos. 22 and 30, 1925-1926

 

32

Electrometer no. 3537 after Wulf, 1912-1915, 1919, 1922, 1933

 

33

Electrometer after Braun (Max Kohl type no. 366 Catalogue 60215), 1915

 

34

Electrometer � Compton 228 (Pyroelectric Co.), 1918

 

35

Electrometer � Dolezalek nos. 17002 and 19278 by the Cambridge Scientific Instrument Co., 1915, 1921-1922

 

36

Electrometer, Dolezalek (Cambridge nos. C-56840, C-116255, C-116257), n.d.

 

37

Electrometer, Hoffman�s Vacuum Duant, serial no. 43, 1930

 

38

Electrometer, Improved Compton, 1928

 

39

Electrometer � Leaf no. 1443, 1922

 

40

Electrometer, Lindemann � Ryerson, n.d.

 

41

Electrometer, Lindemann serial no. 0-185780, 1947

 

42

Electrometer, Lutz-Edelmann single fiber, 1923, 1926, 1930-1931

 

43

Electrometer, quadrant (nos. 14902, 19250, 19284), 1921, 1924

 

44

Electrometer, String type no. 1 for Gerdien Conductivity apparatus, 1910, 1919

 

45

Electrometer, Weichert (no. 3995), 1922

 

46

Electrometer � Weichert�s D.T.M.C.I.W. no. 2, n.d.

 

47

Electrometer, Wulf�s Unifilar (serial nos. 166-167), 1928

 

48

Electrometers, memoranda, 1931

 

49

Electrometers, memoranda on set-up and adjustment of bifilar string of C.I.W. design, 1923

 

50

Electrometers, memoranda regarding single-fiber, 1928, 1930

 

51

Electrometers, recording (Gunther and Tegetmeyer nos. 4946 and 4947), 1909-1912, 1923, 1928

 

52

Electronic Tube � Triple Diode for TV DC � Restorer applications, n.d.

 

53

Electroscope no. 981 after Exner (used for potential gradient observations), 1908-1909

 

54

Electroscope no. 987, 1904-1905, 1907, 1910

 

55

Electroscope no. 1416, 1904-1909

 

56

Electroscope no. 1417, 1904-1907, 1910

 

57

Electroscope, D.T.M.C.I.W nos. 13, 16-18, 1918, 1921

 

58

Electroscope for radioactive apparatus no. 1432, 1910

 

59

Electroscope, Weichert D.T.M.C.I.W no. 10 (originally with conductivity apparatus 4), 1914, 1918

 

60

Electroscope, Wulf universal (serial no. 460), n.d.

 

61

End standard, NBS test no. 87684, 1940

 

62

Engine, Buffalo for Carnegie (Ship) (serial no. 1149), 1927

 

63

Engine, gasoline (Fairbanks Morse no. 639931), 1926

 

64

Equipment received from Nutrition Laboratory, 1946

 

65

Esterline-Angus, 1946-1947

 

66

Etalon, Fabry & Perot no. 0.6.301/22237, 1925

 

67

Exciting coils (for Cyclotron), 1940

 

68

Field-intensity equipment, Huancayo Magnetic Observatory, 1939, 1945

 

69

Field-intensity recording, Instructions for, 1941

 

70

Fork, Precision type 815-A serial no. 152, 1937

 

71

Frequency standard, type FS-344, 1946

 

72

Frequency standard, various types (American Time Products), 1953

 

73

Frigidaire refrigeration outfit, 1924

 

74

Gage, End (B.S. no. L3981-1) (See Disc Gage), 1920

 

75

Gages, Precision (Van Keuren), 1922

 

76

Gages, Van Keuren (33) B.S. test no. Twg 33211, 1922

 

77

Galvanometer no. 1, Marine, 1919

 

78

Galvanometer no. 1, String, 1920

 

79

Galvanometer no. 5, 1916

 

80

Galvanometer no. 28-A, 1915

 

81

Galvanometer nos. 29X and 30X, 1916, 1922, 1925

 

82

Galvanometer no. 31X, 1923

 

83

Galvanometer no. 2250, 1912

 

84

Galvanometer no. 2420, n.d.

 

85

Galvanometer no. 4382N, 1931

 

86

Galvanometer, serial no. 0-5422, n.d.

 

87

Galvanometer nos. 185232, 219612, 1930-1931

 

88

Galvanometer, Broca no. 9688, 1914

 

89

Galvanometer (Cambridge) nos. L40824-L40826, 1931

 

90

Galvanometer, L. and N. [Leeds & Northrup] no. 2420, n.d.

 

91

Galvanometer (L and N. 12993), n.d.

 

92

Galvanometer, Marine (D�Arsonval), Magnet 20696, Tube 20697, 1920

 

93

Galvanometer, Moving coil (serial no. 213), n.d.

 

94

Galvanometer, Paschen no. 15225, 1914

 

95

Galvanometer (Plath no. 206), 1922

 

96

Galvanometer (Rosenthal), 1917

 

97

Galvanometer, Thermo no. 25755, 1919

 

98

Galvanometers, Weston Thermo (nos 14317-14319), n.d.

 

99

Gas boilers, Bryant modes 43 and 45, 1929

 

100

Gas meter no. 3072506, 1933

 

101

Generator, Crocker-Wheeler, 1926

 

102

Generator set, 3-phase (G.E. no. 308881), 1909, 1922

 

103

Generator, Voltage, type 605-B, serial no. 1821, 1943

 

104

Generators, D.C. [Direct Current] (Gen. Elec. 1415082, 1415098), 1923, 1925

 

105

Generators (noise), VHF-UHF, n.d.

 

106

Generators, Van de Graaff, 1932

 

107

Gimbal stand no. 1, 1917

 

108

Gimbal stand � reversible C.D.C., 1918

 

109

Graphic instruments (connection diagrams and instrument data sheet), 1950

 

110

Graphic meters, Esterline-Angus serial nos. 30507, 31213, 1940

 

111

Gravity apparatus (Meinesz) Part 1, 1929

 

112

Gravity apparatus (Meinesz) Part 2, 1929-1930

 

113

Gravity apparatus (Meinesz) Part 3, 1929

 

114

Gravity apparatus (Meinesz) Extra copies, 1929

 

115

Gravity meter, Worden, 1951, 1957-1958

 

116

Grinder, Dumore Electric, serial no. A-35229, 1931

 

117

Grinding machine, Universal cutter and reamer, serial no. 2185, 1929

 

118

Harmonic analyzer (Mader), 1931, 1944

 

119

Helmholtz coil schematics, ca. 1933

Map Case 1

6

Helmholtz-Gaugain coil � General, n.d.

4

120

High pressure pump for DNA depolymerization, Sept 1970

Map Case 1

7

Hygrodynamics Hygrometer, 1963-1970

4

121

Inductance, Mutual (L. and N. no. 207574), 1927

5

1

Induction coefficient apparatus by Topfer (Weber�s method), 1892, 1908

 

2

Influence machine, Wommelsdorf by the Berliner Elektros � Gesellschaft, n.d.

 

3

Inventory California Institute of Technology, 1922-1924, 1930

 

4

Inventory � Lists, receipts, reports for field men, 1905-1922

 

5

Inventory � Lists, receipts, reports for field men, 1923-1932

 

6

Inventory � Lists, receipts, reports for field men, 1933-1947 [1948]

 

7

Inventory � Miscellaneous, 1919-1940

 

8

Inventory � Miscellaneous, 1941-1945

 

9

Inventory � Miscellaneous, 1946-1950

 

10

Inventory � Miscellaneous, 1951

 

11

Inventory monthly equipment totals, 1922-1949

 

12

Inventory � Odograph, etc., 1941-1947

 

13

Inventory statements, summaries, etc., 1904-1950

 

14

Ion counter 1 with electroscope 3993, 1913-1930

 

15

Ion counter 1455 after Ebert with electroscope no. 1443 and dry pile 1410, 1904-1928

 

16

Ionic-content memoranda, 1928, 1933

 

17

Ionium, 1930

 

18

Ionium cells 7,8,9, and 10, 1925, 1927

 

19

Ionium collectors, 1927-1937

 

20

Ionium collectors for Carnegie (Ship), 1928

 

21

Ionization-apparatus, portable, C.I.W. no. 3, 1940

 

22

Ionization gauge, 1927

 

23

Ionosphere-equipment (Central China College), 1937

 

24

Ionosphere-equipment (Huancayo Observatory), 1933-1940

 

25

Ionosphere-equipment, Instructions for operation and maintenance, 1935-1936, 1943

 

26

Ionosphere-equipment (Watheroo Observatory), 1928, 1932-1937

 

27

Ionosphere-general, 1933-1941

 

28

Ionosphere measuring equipment, A tracking system for, 1945

 

29

Ionospheric instructions � Part 1, 1935-1937

 

30

Ionospheric instructions � Part 2 (Folder 1), 1935-1938

 

31

Ionospheric instructions � Part 2 (Folder 2), 1935-1938

 

32

Ionospheric instructions � Part 3, 1937-1938

 

33

Ionospheric instructions � Part 4, 1938, 1941

 

34

Ionospheric instructions for constant-frequency A.C. system equipment no. 3, 1941

 

35

Ionospheric Recorder, Manual Multifrequency D.T.M.C.I.W Model 2, 1944

 

36

Ionospheric Recorder, Manual Multifrequency, Communications Liaison Branch, Radio Propagation Section, Model 1, 1945

 

37

Ionospheric Recorder, Manual Multifrequency, Communications Liaison Branch, Radio Propagation Section, Model 2, 1945

 

38

Keller Balance, Instructions, n.d.

6

1

Kennelly-Heaviside layer apparatus � Huancayo Magnetic Observatory, 1931-1932

 

2

Kennelly-Heaviside layer equipment for use at observatory stations, 1932

 

3

Kennelly-Heaviside layer measurements, I.P.Y. [International Polar Year], 1932

 

4

Kenotron FP-85, n.d.

 

5

Kenotrons, General Electric, types KR-3, KR-4, and KR-5, 1933-1934

 

6

Kensington Experimental Station, 1933, 1936-1937

 

7

Kohler, Electric plants, 1928, 1938-1939

 

8

Lamp and Scale reading device (Leeds and Northrup Co. no. 195740), 1931

 

9

Lamp, magnetograph, tubular bulb La Cour type, 1932

 

10

[Lamps, Cooper Hewitt Electric Co.], 1921-1922

 

11

Landis electric time and program clock system, 1926-1934, 1943

 

12

Leak-free and null method, measurement of air-potentials, n.d.

 

13

Lectrodryer, type CW-25, serial no. 452, 1938

 

14

Length standards, test of stainless steel, 1941

 

15

Level, Instrument (Berger 9158), 1922

 

16

Load, Coaxial, 1958, 1960

 

17

Low frequency standard model 100D, Serial 142 and above, 1950, 1952

 

18

Magnetic Inductor (serial no. 109), n.d.

 

19

Magnetic instructions, Byrd Antarctic Expedition 1928-1929, Byrd Expedition II, 1928, 1933

 

20

Magnetic instructions, Byrd Expedition II (E.H. Bramhall, Observer), 1933-1934

 

21

Magnetic instructions, Clyde River, Ionosphere Station, 1943

 

22

Magnetic instructions, College Magnetic Observatory, 1937, 1941-1942

 

23

Magnetic instructions, Fitzsimmons (During War II while with Air Forces), 1943

 

24

Magnetic instructions Iceland Ionospheric Station, 1943

 

25

Magnetic instructions Louise A. Boyd Expedition, 1941 (F.R.Gracely, Observer), 1939-1943

 

26

Magnetic instructions MacGregor Arctic Expedition 1932, 1937-1938, 1941

 

27

Magnetic instructions U.S. Antarctic Service, 1939-1941

 

28

Magnetic observations Pilar Magnetic Observatory, 1943 (Messrs. Campbell and Keller, Jr.), 1943

 

29

Magnetic observations U.S. Naval Observatory August 31, 1943

 

30

Magnetogram Pricker, Huancayo, 1932, 1936

 

31

Magnetogram Pricker, Watheroo, 1932

 

32

Magnetograph D.T.M. no. 1 (La Cour regular magnetograph), 1931-1933, 1941

 

33

Magnetograph D.T.M. no. 2 (La Cour rapid magnetograph), 1931-1932

 

34

Magnetograph D.T.M. nos. 3 and 4 (La Cour insensitive magnetograph), 1932, 1937, 1941

 

35

Magnetograph D.T.M. nos. 6 and 7 (La Cour rapid-running magnetograph), 1932-1933

 

36

Magnetograph D.T.M.C.I.W. no. 7 (La Cour insensitive magnetograph), 1933

 

37

Magnetograph D.T.M. visually recording, Clyde River, Canada, 1943

 

38

Magnetograph (Marine), 1931

 

39

Magnetograph, portable, Point Barrow, 1940-1941, 1945, 1949

 

40

Magnetograph set 1, 1916-1919, 1931-1936, 1940-1945

 

41

Magnetograph set 2, 1916-1917, 1931-1941

 

42

Magnetograph set 3, 1916

 

43

Magnetograph set 4, 1917-1919

 

44

Magnetograph, visual, D.T.M.C.I.W no. 3, 1944

 

45

Magnetometer no. 1, 1906-1909, 1911, 1919

 

46

Magnetometer no. 2, magnet no. 2LA, 1906-1907, 1909-1910, 1914

 

47

Magnetometer no. 3, 1907-1912, 1915-1917

 

48

Magnetometer no. 3, Discussions Constants, 1908-1929

 

49

Magnetometer no. 4 magnets no. 4L and no. 4S, 1907-1910, 1914-1915

 

50

Magnetometer no. 5, 1907-1911, 1914-1919, 1922

 

51

Magnetometer no. 6, 1908, 1911-1914, 1942

 

52

Magnetometer no. 7 (D.T.M.C.I.W.), 1908-1910, 1913-1916, 1941, 1944

 

53

Magnetometer no. 8, 1908-1913, 1918-1926, 1931-1941

 

54

Magnetometer no. 9, magnets 9L and 9S, 1908-1914, 1919-1922, 1934-1945

 

55

Magnetometer no. 10 (D.T.M.C.I.W.), 1908-1966

 

56

Magnetometer-inductor no. 12, 1910-1912, 1917-1928, 1944

 

57

Magnetometer-inductor no. 13, 1910-1915, 1919-1937, 1949

 

58

Magnetometer no. 14, 1910-1923

 

59

Magnetometer no. 15, 1910

 

60

Magnetometer-inductor no. 16, 1912-1946, 1953

 

61

Magnetometer no. 17, 1911-1919, 1922-1926, 1932-1939

 

62

Magnetometer-inductor no. 18 (D.T.M.C.I.W.), 1916, 1928-1935

 

63

Magnetometer (Universal) no. 19, 1912-1916, 1922, 1945

 

64

Magnetometer (Universal) no. 20, 1912-1921

 

65

Magnetometer (Universal) no. 21, 1912-1920, 1933-1936

 

66

Magnetometer (Universal) no. 22, 1912-1913

 

67

Magnetometer (Universal) no. 23 (Earth inductor pattern), 1913

 

68

Magnetometer-inductor no. 24, 1914-1923, 1928-1931

 

69

Magnetometer-inductor no. 25, 1914-1919, 1922-1929, 1931, 1941

 

70

Magnetometer-inductor no. 26, 1914-1917, 1922-1925, 1930-1933, 1942, 1955

 

71

Magnetometer-inductor no. 27, 1915-1925, 1933, 1939, 1941

 

72

Magnetometer-inductor no. 28, 1915-1922, 1935-1949

 

73

Magnetometer Chasselon no. 55 (purchased from Weather Bureau, Jan. 12, 1916), 1908

 

74

Magnetometer Edelmann, B.S. no. 65 (purchased from Weather Bureau, January 12, 1916), 1905-1908, 1916

 

75

Magnetometer (Theodolite) with Earth-Inductor attachment (description and directions for using), 1930

 

76

Magnetometer no. 8 (U.S.C. and G.S.), 1900

7

1

Magnetometer no. 10 (U.S.C. and G.S.), 1906

 

2

Magnetometer Chasselon no. 15 French-type (Prof. Henri Pittier), 1917

 

3

Magnetometer no. 15 (Cooke) Dominion Observatory, 1915

 

4

Magnetometer no. 17 (U.S.C. and G.S.), 1905, 1908

 

5

Magnetometer no. 19 (U.S.C. and G.S.), 1908

 

6

Magnetometer no. 20 (U.S.C. and G.S.), 1901, 1906-1910, 1915

 

7

Magnetometer no. 21 Magnets 21L1 and 21L2 (U.S.C. and G.S. - French make), 1907-1908

 

8

Magnetometer no. 24 (Property of Zi-Ka-Wei Observatory), 1907-1908

 

9

Magnetometer no. 30 (U.S.C. and G.S.), 1902-1908

 

10

Magnetometer no. 31 (Elliott Bros., London), 1909-1911

 

11

Magnetometer no. 36 (U.S.C. and G.S.) Dip circle no. 172, 1906-1908, 1911

 

12

Magnetometer no. 37 (U.S.C. and G.S.), n.d.

 

13

Magnetometer, Horizontal-force (QHM) no. 42, 43, 44 (La Cour pattern), 1926-1957

 

14

Magnetometer no. 49 (Property of Zi-Ka-Wei Observatory), 1909

 

15

Magnetometer no. 55 (Property of Hong Kong Observatory), 1909

 

16

Magnetometer no. 68 (Massachusetts Institute of Technology), 1905, 1911

 

17

Magnetometer no. 73 (Elliott Bros., London), 1901-1911

 

18

Magnetometer-Inductor no. 102 (Constructed by Precise Inst. Co. for Argentine Meteorological Office), 1926

 

19

Magnetometer-Inductor no. 103 (Constructed by Precise Instrument Co. for San Fernando Observatory), 1926

 

20

Magnetometer-Inductor no. 104 (Dominion Observatory, C.I.W. type), 1931

 

21

Magnetometer-Inductor no. 105 manufactured for Argentine Government by Precise Instrument Company, 1926

 

22

Magnetometer-Inductor no. 107 (Manufactured for National Obs�y of Mexico by Precise Inst. Co.), 1926, 1947

 

23

Magnetometer-Inductor no. 108 [for Swedish Hydrographic Office], 1927

 

24

Magnetometer-Inductor nos. 109 and 110 [for Brazilian Government], 1931-1932, 1947

 

25

Magnetometer-Inductor no. 111 (Constructed by Precise Instrument Co. for British Admiralty), 1936-1937

 

26

Magnetometer no. 143, Dover Unifilar (Property of U.S. Navy), 1900, 1926-1927

 

27

Magnetometer no. 150 (Property of U.S. Navy), 1905, 1933

 

28

Magnetometer no. 156 (Property of U.S. Navy), 1926-1927

 

29

Magnetometer no. 172 (Property of Chilean Meteorological Office), 1933-1934

 

30

Magnetometer Tesdorff no. 1977 (with dip circle attachment) [Dominion of Canada Survey], 1908, 1915-1916

 

31

Magnetometer no. 2025 (Apia Observatory), 1908, 1911, 1930

 

32

Magnetometer corrections, 1932

 

33

Magnetometer-inductor schematics, 1922

Map Case 1

8

Magnetometer QHM Quartz-fiber horizontal-force (La Cour pattern), 1930, 1936

7

34

Magnetometer schematics, 1927, n.d.

Map Case 1

9

Magnetometers, C.I.W. no 9 to 28 H-correction graphs, 1908-1945

7

35

Marine collimating compass schematics, n.d.

Map Case 1

10

Megohm no. 1369 (Gambrell), 1920

7

36

Mercury lamp, 1950

 

37

Meter Bar no. B.S. 184, 1910, 1915, 1937

 

38

Meter, Beta Gamma, type RD-316, n.d.

 

39

Meter, Counting-Rate, type 1500-B, 1952

 

40

Meter, Radioactive, Model MX-3A, 1951

 

41

Meter, Ultra-sensitive D-C serial no. 548, 1939

 

42

Metric gage blocks, Johansson, 1942

 

43

Microammeter, Sensitive research no. 10246, 1934

 

44

Microammeter, Weston no. 269, 1936

 

45

Microammeter, Weston D.C. (Serial nos. 2364, 2510, 2860, 2918, and 5248, Model 322), 1926, 1928, 1932

 

46

Microbarograph R/12928, 1936-1939

 

47

Micromax recorders, Model S, n.d.

 

48

Micrometer Caliper standardizations, 1910-1916

 

49

Miller, Cataract Horizontal bench, (Serial no. 11232), 1928, n.d.

 

50

Milliammeter (Weston nos. 35945, 41807, 44698-44699), 1925, 1932

 

51

Milliammeter, Weston D.C. (Model 1, no. 49087), 1932

 

52

Milliammeters, DC -93854-5, 1952

 

53

Millikan-Neher electroscope, 1936, 1940, 1947

 

54

Mitchell apparatus, College-Fairbanks, 1931-1935

 

55

Mitchell apparatus, Huancayo, 1931, 1933

 

56

Mitchell apparatus, Watheroo, 1932-1935

 

57

Motor-Generator-Huancayo Magnetic Observatory, 1930-1931

 

58

Motor-Generator set (Motor 2858247, Generator 2858239), n.d.

 

59

Nuclear measurement and detection instruments, 1959

 

60

Octant no. 2679 with Gyroscope Collimator, 1907

 

61

Optical flats, 1922

 

62

Oscillator, type 1208-A unit, n.d.

 

63

Oscillator, ultra-low frequency, n.d.

 

64

Oscillator: unit crystal type 1213A, n.d.

 

65

Oscillograph, 303 Cathode-ray, 1952

 

66

Oscillographs, the magnetic direct-inking, models BL-201 and BL-202, 1946

 

67

Oven, Precision Scientific Company (Model no. 120, Serial no. 120-944), 1948

 

68

[Penetrating-Radiation apparatus no. 1], 1919-1920, 1928

 

69

Penetrating-Radiation apparatus Kolh�rster (G. and T. [G�nther and Tegetmeyer] nos. 5503, 5658), 1928-1929

 

70

Penetrating-Radiation memos, 1928

 

71

Penmotor, magnetic, instruction for BL-902, BL-902A, 1945

 

72

Photocell no. 60, calibration of, 1940

 

73

Photocell WL-775, 1940

 

74

Photoelectric cells NBS test no. 90769, 1940

 

75

Photoelectric recorder, n.d.

 

76

Photographic equipment and technique, 1931, 1940

 

77

Photographic formulas, 1933-1936

 

78

Photographic papers for recording purposes, 1935

 

79

Photo-reduction apparatus, 1931

 

80

Pitot-static trailing bomb, 1944

 

81

Planimeters, n.d.

 

82

Pliotron FP-54 nos. 1354 and 1355, 1931-1933

 

83

Pliotron PJ-11, 1932

 

84

Polar Year, 1932-1933 [Included is a cahier for the Byrd Antarctic Expedition II.]

 

85

Polyranger (direct-current) (Serial no. 9509), 1931

 

86

Potential-Gradient apparatus nos. 1A, 2-4, 6-8, 1917-1922, 1927-1937

 

87

Potential-Gradient apparatus, Apia Observatory, 1935, 1937

 

88

Potential-Gradient apparatus memoranda, 1927-1931, 1937

 

89

Potentiometer (Leeds and Northrup Company) no. 7552, n.d.

 

90

Potentiometer no. 65814, 1920

 

91

Potentiometer (Leeds and Northrup no. 75825), 1922, 1928

 

92

Potentiometer (Leeds and Northrup nos. 105856, 210794), 1932

 

93

Potentiometer no. 217916, 1937

 

94

Potentiometer (Leeds and Northrup, Serial no. 217916), 1937

 

95

Potentiometer, Serial no. 222243 (Students�, cat. No. 7651), 1932

 

96

Potentiometer L. and N. Serial no. 318097, 1948

 

97

Potentiometer, Photoelectric model 721, 1940

 

98

Potentiometer, Special (Leeds and Northrup no. 83765), 1923

 

99

Potentiometer, Wolff 5471, 1921, 1935

 

100

Potsdam-Corrections on Potsdam standard on various observatories, n.d.

 

101

Power Plant, Huancayo Observatory Part 1, 1930-1931

 

102

Power Plant, Huancayo Observatory Part 2, 1934-1937, 1939

 

103

Power Plant, Watheroo Observatory [Part 1], 1933, 1939

 

104

Power Plant, Watheroo Observatory Part 2, 1935-1939

 

105

Power Supply, Model 710A Serial 1150, n.d.

 

106

Power Supply, Regulated Models 25 and 28, n.d.

 

107

Power Supply unit type 1203-A, n.d.

 

108

Prism, Leeds and Northrup cat. no. 2178, 1931

 

109

Projection machine, Bausch and Lomb, 1936

 

110

Psychrometer-use of, 1929

 

111

Pump, Diffusion air (Leybold no. 72177), 1931

 

112

Pump, Distillation, 1938

 

113

Pump, Gaede Diffusion air (type A, no. 72099), 1927

 

114

Pyrovolter, 1922

 

115

Quartz-crystals for radio transmitter no. 1, 1930, 1932

 

116

Quartz-crystals for Watheroo Observatory, 1930

 

117

Quartz fibers, Production of, n.d.

 

118

Radiantfires, Humphrey, n.d.

 

119

Radio-activity of air apparatus after Elster and Geitel, 1905, 1908

 

120

Radio equipment-Huancayo Observatory, 1929

 

121

Radio equipment, license, etc. for Carnegie (Ship), 1928

 

122

Radio equipment � Watheroo Observatory, 1929-1931

 

123

Radio-frequency bridge Type 916A, n.d.

 

124

Radio receiver no. 1, Field, 1931

 

125

Radio receiver, BC-224-H, n.d.

 

126

Radio receiving set (Dept. no. 2), 1924

 

127

Radio set SCR-268C, 1943, 1947

 

128

Radioactive collectors, 1927

 

129

Radioactive-content apparatus 4, 1919

 

130

Radioactive decay-curves obtained on Carnegie (Ship), 1919, 1928

 

131

Radioactive standards, 1940, 1944

 

132

Radioactivity meter, 1951

 

133

Radium and Radium preparations, 1922, 1929

 

134

Radium Luminour material, instructions for applying, 1928

 

135

Receiver, National model HFS, 1952

 

136

Receiver, Type SCR-2, 1945

 

137

Recorder GEI-6465, Photoelectric, 1952

 

138

Recording apparatus no. 5, 1917

 

139

Rectifier, Mercury arc (Gen. Elec. No. 125817-18), 1922, 1925

 

140

Relative humidity and vapor-pressure (at Watheroo and Huancayo Observatories), 1930-1931

8

1

Relative humidity recorder, 1926

 

2

Resistance boxes-Pyroelectric 202 and 203, 1918

 

3

Resistance standard (O. Wolff, Serial no. 5488), 1937

 

4

Resistance-thermometer outfit for Carnegie (Ship), 1927-1928

 

5

Resistance, Wolff no. 5488, 1920, 1934, 1937

 

6

Resistors, 1967

 

7

Rheostat, Allen-Bradley (no 157235), n.d.

 

8

Rheostat, Biddle 68209, 1919

 

9

Rife Rams � H.M.O. [Huancayo Magnetic Observatory], 1928-1929, 1935-1945

 

10

Roll and Pitch recorder (Sperry Gyroscope Co, Mark II, Model 6, Serial no. 2), 1915-1919, 1928

 

11

Rotary converter, Roth Bros., 1931

 

12

Salinity apparatus, Electrical (D.T.M. no. 1), 1923, 1927-1930

 

13

Salinity apparatus (Richter and Wiese, Serial no. 145), 1928

 

14

Sander no. 7900, n.d.

 

15

Scales, Even balance counter (no. 1076064), n.d.

 

16

Scaling glass, I.P.Y. [International Polar Year], n.d.

 

17

Schematics for conductivity apparatus, 1921-1930

Map Case 1

11

Schematics for ionospheric equipment M80-M85, ca. 1937-1938

 

12

Schematics for ionospheric equipment: Circuitry C43-C75, ca. 1937-1938

 

13

Schematics for potential gradient apparatus, 1923-1927

 

14

Searchlight, 1940, 1944-1945

8

18

Seismic code, n.d.

 

19

Seismic constants (International Code for Seismic Telegrams), n.d.

 

20

Seismograms, Principles underlying interpretation, 1932

 

21

Seismograph, Benioff-Huancayo, 1931-1933, 1939-1941

 

22

Seismograph, Galitzen (Description and quotation), 1923

 

23

Seismograph-recorder-Huancayo, 1931-1932, 1935

 

24

Seismograph, Wenner no. 9E and 9N, 1931-1939

 

25

Seismological code, Science Service, n.d.

 

26

Seismometer, McComb-Romberg horizontal seismometer, 1932

 

27

Seismometer, Wenner directions, 1930-1932

 

28

Sextant, artificial Horizon (no. 2) Property of Coast Survey, 1922

 

29

Sextants-memoranda repairs and alterations, 1909-1919

 

30

Short-period measurements, Directions for, Ivigtut, Greenland, 1943

 

31

Short-wave reception, 1930-1931

 

32

Signal-intensity app. [apparatus] no. 2, 1928

 

33

Sine-Galvanometer 1, 1935-1944

 

34

Small-ion counter, Carnegie (Ship), 1933-1934

 

35

Solarimeter no. 1, 1928

 

36

Space charge apparatus, 1929

 

37

Spectrohelioscope, Huancayo, 1931-1937

 

38

Spectrohelioscope, Watheroo, 1932-1937

 

39

Spectroscope, Hilger wavelength 6139, 1907, 1911

 

40

Spyglasses, 1917

 

41

Stabilizing unit, Serial no. 632, 1932

 

42

Standard, low frequency, Model 100D, 1950, 1953

 

43

Standard Scale-B.S. no. 2804, 1921

 

44

Station differences for piers in S.M.O. [Standardizing Magnetic Observatory], 1915-1919

 

45

Statoscope, 1928

 

46

Stereoscopic projections, 1929-1936

 

47

Still, directions for operating Boyer, 1920

 

48

String electrometer schematics, 1922

Map Case 1

15

Strobotac, type 631-B, BL, n.d.

8

49

Submarine photography, 1928

 

50

Sunshine recorder, Huancayo, 1931

 

51

Synchronizing equipment (Catalog no. 9820), 1927-1931

 

52

Tachometer, Reliance nos. 5142, 5166, and 5293, 1921

 

53

Tents, specifications for non-magnetic observing, 1930, 1946

 

54

Testing set (Leeds and Northrup, Serial no. 145972), n.d.

 

55

Testing sets (Leeds and Northrup), portable, n.d.

 

56

Theodolite 3578, Berger, 1914, 1928-1937, 1941-1943

 

57

Theodolite Berger no. 4941, 1931

 

58

Thermocouple, platinum, Leeds and Northrup, no. 20235 (order 1265), 1914, 1916

 

59

Thermograph, recording (Negretti and Zambra no. 6438), 1927

 

60

Thermometer, freezing-point (PTR 486), 1929

 

61

Thermometers, B.S. [Bureau of Standards] nos. 28408-28423, 28424-28436, 37846-37857, 1922, 1926

 

62

Thermometers, B.S. [Bureau of Standards] nos. 41913-41921, 43167-43168, 44619-44624, 44625-44630, 1927-1928

 

63

Thermometers, B.S. [Bureau of Standards] nos. 53120-53131, 61585, 62388-62393, 62394-62399, 1930, 1935

 

64

Thermometers, Bureau Standards tests nos. 1243 to 3059, 1905-1908

 

65

Thermometers, Bureau Standards tests nos. 3060 to 6722, 1908-1911

 

66

Thermometers, Bureau Standards tests nos. 6723 to 8184, 1911-1912

 

67

Thermometers, Bureau Standards tests nos. 8185 to 9522, 1912-1913

 

68

Thermometers, Bureau Standards tests nos. 9523 to 13380, 1913-1916

 

69

Thermometers, Bureau Standards tests nos. 22950 to 22966, 1920

 

70

Thermometers, Bureau Standards tests nos. 28410, 28412, 1941

 

71

Thermometers, Bureau Standards tests nos. 70489 to 70498, 1939

 

72

Thermometers, Bureau Standards tests nos. 73143, 73144, 1941

 

73

Thermometers, Bureau Standards tests nos. 74883, 74884, 1941

 

74

Thermometers, Centigrade, H.J. Green B.S. nos. 57926 to 57937 inclusive, 1932

 

75

Thermometers, Centigrade, H.J. Green NBS [National Bureau of Standards] nos. 73907 to 73918 inclusive, 1941

 

76

Thermometers, Centigrade, H.J. Green NBS [National Bureau of Standards] nos. 75911 to 75922 inclusive, 1942

 

77

Thermometers, Centigrade, H.J. Green NBS [National Bureau of Standards] nos. 80355 to 80366 inclusive, 1944

 

78

Thermometers, Centigrade, H.J. Green NBS [National Bureau of Standards] nos. 80551 to 80574 inclusive, 1944

 

79

Thermometers for Assmann aspiration (PTR nos. 2584 and 2587 psychrometer no. 18690), 1929

 

80

Thermometers (Oceanographic), 1933

 

81

Thermometers, Reversing (German Atlantic Expedition), 1928

 

82

Thermometers, Reversing (Protected PTR nos. 158-163, 197-203, 205-206, 264, 908-909, 3376-3379, 4246, 4251-4252, 4258-4260), 1928-1929

 

83

Thermometers, Reversing (PTR nos. 211-214, 502-516, 117838-118990, 127075-127089, 127552-127559, 127584-127593), 1927-1928

 

84

Thermometers, Reversing (Unprotected PTR nos. 865-866, 868-871, 1688-1703, 2993-2997, 3829), 1928-1929

 

85

Thermometers, Reversing and surface (Property of Geophysical Inst. [Institution], Bergen), 1928

 

86

Thermopile, Moll, 1928

 

87

Thyratron FG-57, 1931

 

88

Tidegauge; Field automatic (Bausch & Lomb no. 11664), 1923

 

89

Tools, tipped (Rāmet), 1931

 

90

Transceiver, SSB, RF communications, n.d.

 

91

Transformer (auto), Serial no. C-101485, 1927

 

92

Transmitter (The Creed), n.d.

 

93

Tube base data connections and chart, 1936

 

94

Tube checkers, Test data for Weston modes 770-771-773 and 775, 1937-1938, 1942

 

95

Tube, RAC developmental, no. C798-B, 1946

 

96

Typewriter, IBM Electromatic (Serial no. 418-12059), 1949

 

97

Undulator (The Creed), n.d.

 

98

Uniform regulations and personal outfit for Carnegie (Ship) observers, 1928

 

99

Upper-air observations, Huancayo and Watheroo, 1931

 

100

Vacquier Magnetometer, 1940, 1942

 

101

Vacuum Gauge tube 3850264G1, 1934

 

102

Variograph � Askania Werke, 1955-1957, 1962

9

1

Variograph � G�ttingen, 1957, 1964-1965

 

2

Variometer, Coil, 1924-1925, 1929-1931

 

3

Variometer (Copenhagen), 1941, n.d.

 

4

Variometer � G�ttingen, 1965

 

5

Variometer, la Cour (general), 1932-1933, 1937, 1941

 

6

Variometer, Vertical intensity Serial no. 89809, 1939

 

7

Variometer, Z Induction, 1936

 

8

Variometers, general, 1935

 

9

Visibility meter, D.T.M. no. 1, 1930

 

10

Voltage-controller, automatic, Description and instruction for operation, 1941

 

11

Voltmeter, Electrostatic (nos. ESV-900-R, 1437, L-11878), 1919, 1924-1925

 

12

Voltmeter, Laboratory standard (Weston no. 1442), 1925

 

13

Voltmeter, Vacuum tube model V-6, n.d.

 

14

Voltmeter, Weston nos. 1204, 32738, 33228, 33657, 34664, 1919-1929

 

15

Voltmeter, Weston nos. 34767, 35515, 36973, 44934, 45206, 49996, 49997, 50332, 50610, 50695 model 1, 1923-1939

 

16

Voltmeter, Weston Millivoltmeter nos. 49848, 49850 model 1, 1931

 

17

Watch Dent no. 54672 (Deck), 1905

 

18

Watch (Ditisheim) nos. 24561, 36146, 1912-1913

 

19

Watch � D.T.M.C.I.W. nos. 121, 122, 1918

 

20

Watch (Leroy) nos. 8282, 8650, 1911-1912

 

21

Watch nos. B250254, B250304 (W.C. Ball Watch Co.), 1916

 

22

Water bottle, Nansen, 1928

 

23

Water bottle, Propeller reversing, 1929

 

24

Watt-Meter, Weston model 310, n.d.

 

25

Whiteprint machine, Ozalid model �F,� 1943-1944

 

26

Wilson-Balckett apparatus, 1930-1931

 

27

Winch (Lidgerwood) used on Carnegie (Ship), 1937

 

28

Wollaston wires, 1926-1927

 

29

Wringer, Blue-print, 1922

 

30

X-ray apparatus (Kelley-Koett), 1922-1923, 1929

 

31

X-ray meter, 1935

 

32

 

 

 

Series 3, Subseries 2: National Defense Correspondence, 1943-1949

 

 

NOrd, 1945, 1947-1948

9

33

ND-WF, 1946

 

34

Bailment agreement W 33-038 ac � 14852 (16301), 1945-1948

 

35

NOas, 1945-1947

 

36

NObs, 1945-1946

 

37

NObs, NDCrc.-187 and Engineer Board, 1944-1946

 

38

NXs-W, 1943-1948

 

39

College Obs�y [Observatory], 1944, 1946

 

40

Clyde Station, 1943-1946, 1949

 

41

NSC-B [1 of 2], 1945-1946

 

42

NSC-B [2 of 2], 1943-1947

 

43

Navy # 1 Station (China # 1), 1945-1946

 

44

Navy no. 2 Station, 1945

 

45

Christmas Island Station, 1944-1946

 

46

Trinidad Station, 1943-1946

 

47

Hawaii Station, 1943-1946

 

48

Adak Station, 1945-1946

 

49

Iceland Station, 1943-1946

 

50

Signal Corps # 1 Station (Leyte), 1945

 

51

Signal Corps # 2 Station (Guam), 1945-1946

 

52

Signal Corps no. 3, 1945

 

53

Applied Physics Lab J.H.U. [Johns Hopkins University], 1942-1945

 

54

Northern HUTS, 1943, 1946

 

55

 

 

 

                   

Subject Terms

Topics:           Geophysical instruments

                        Magnetometer

Scientific apparatus and instruments

 

Corporate Names:       Carnegie Institution of Washington. Dept. of Terrestrial Magnetism

                                    Carnegie (Ship)

 

Forms:            Card indexes

                        Correspondence

                        Inventories

                        Laboratory notebooks

 

Related Collections

 

Department of Terrestrial Magnetism General Files, 1904-Present. Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, D.C.

 

Department of Terrestrial Magnetism Photograph Collection [unprocessed]. Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, D.C. See:

 

Instruments Series

 

Partial list of National Defense codes

NOrd               Naval Ordnance Laboratory

ND-WF           National Defense [?] � Wright Field

NOas               Naval Ordnance [?] � Aviation Supply

NObs              Naval Ordnance [?] � Bureau of Ships

NDC               National Defense Contract [?]

NSC-B            Navy Signal Corps: Bureau of Standards [?]