Thomson voltmeter
Date1910-1930
Inventory Number0216
ClassificationVoltmeter
Subject
Maker
General Electric Company
1892-present
User
Harvard University Department of Physics
founded 1726
Cultural Region
Place of Origin
Place of Use
Dimensions14 × 15.9 × 9 cm (5 1/2 × 6 1/4 × 3 9/16 in.)
blue board box: 11.4 × 38.1 × 31.1 cm (4 1/2 × 15 × 12 1/4 in.)
blue board box: 11.4 × 38.1 × 31.1 cm (4 1/2 × 15 × 12 1/4 in.)
Material
DescriptionA fan-shaped voltmeter, mounted on a square wooden base with rounded corners. The fan-shaped instrument case is similar to the Weston meter, model #1, and contains a Dynamometer coil, to which a thin indicator needle is attached. The instrument display window is an irregular, fan shape. The display's printed scale goes from 0 - 65 volts (non-linear). Below the scale, is a reflecting strip.
The fan-shaped instrument case has a protruding half-dome centered at the bottom, beneath which the instrument coil is housed.
Mounted on the wooden base are two binding posts, another knob and a push button.
The fan-shaped instrument case has a protruding half-dome centered at the bottom, beneath which the instrument coil is housed.
Mounted on the wooden base are two binding posts, another knob and a push button.
Signedprinted on instrument display: GEN. ELEC. CO. U.S.A.
Inscribedprinted on instrument display: THOMSON VOLTMETER / NO. 5111 / GEN. ELEC. CO. U.S.A. / PAT'S APPLED FOR; Base numbered: 5111
ProvenanceFrom the Physics Department. Harvard University.
Historical AttributesPhysics Dept. Old Nos. - blue triangle - indicates use in Physics 3 in the late 1920's.
Weston Electrical Instrument Corporation
Date: 1894
Accessories: Weston portable multiplier (0279b); standardization certificate on back of lid
Object number: 0279a
Weston Electrical Instrument Corporation
Date: 1911
Accessories: shunt (0438b)
Object number: 0438a
Weston Electrical Instrument Corporation
Date: late 19th Century
Accessories: two shunts (#0270b and #0270c); special leads
Object number: 0270a
Weston Electrical Instrument Corporation
Date: 1900-1917
Accessories: wooden instrument case (0526d); shunts (0526b and 0526c)
Object number: 0526a
Weston Electrical Instrument Corporation
Date: circa 1925
Accessories: shunt (0531b); box of 6 screws, two modified bolts, and one small piece of wood (all these originally housed in petri dish, now transferred to archival box)
Object number: 0531a
Weston Electrical Instrument Corporation
Date: late 19th Century
Accessories: 0269b (which is a multiplier for 0269a)
Object number: 0269a
Weston Electrical Instrument Corporation
Date: circa 1890
Object number: 1997-1-1061
Weston Electrical Instrument Corporation
Date: circa 1914
Accessories: multiplier in case of instrument; standardization certificate from the Weston Laboratory, Newark, N.J. Feb.1914 on lid of wooden case
Object number: 0278
General Electric Company
Date: late 19th-mid 20th Century
Accessories: multiplier ( 0271b)
Object number: 0271a