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Ayrton and Perry direct reading spring voltmeter

Ayrton and Perry direct reading spring voltmeter

Queen & Company
1893-1912
Thomson-Rice A.C. voltmeter

Thomson-Rice A.C. voltmeter

American Electric Company
1875-1890
alternating current voltmeter

alternating current voltmeter

American
1900-1930
direct current voltmeter

direct current voltmeter

Deprez et Carpentier
1890-1910
alternating current voltmeter

alternating current voltmeter

Department of Physics, Harvard University
1920-1930
Thomson voltmeter

Thomson voltmeter

General Electric Company
1910-1930
Sir William Thomson's multicellular voltmeter

Sir William Thomson's multicellular voltmeter

James White
circa 1890
voltmeter

voltmeter

Hartmann & Braun AG
late 19th-20th Century
voltmeter

voltmeter

Weston Electrical Instrument Corporation
1920-1930
electric voltameter

electric voltameter

French
circa 1885
switchboard meter

switchboard meter

Weston Electrical Instrument Corporation
circa 1920
general electric voltmeter

general electric voltmeter

General Electric Company
1909-1930
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The Collection of Historical Scientific Instruments
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p. 617-495-2779 • f. 617-496-5794
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