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AC and DC voltmeter

AC and DC voltmeter

Stanley Electric Manufacturing Company
1890-1905
alternating current voltmeter

alternating current voltmeter

American
1900-1930
alternating current voltmeter

alternating current voltmeter

Department of Physics, Harvard University
1920-1930
Ayrton and Perry direct reading spring voltmeter

Ayrton and Perry direct reading spring voltmeter

Queen & Company
1893-1912
Cardews hot wire voltmeter

Cardews hot wire voltmeter

Queen & Company
1893-1912
milli-volt and ammeter

milli-volt and ammeter

Siemens & Halske AG
circa 1910
millivoltmeter and case

millivoltmeter and case

Weston Electrical Instrument Corporation
1900-1917
milli-voltmeter, Weston DC model 1

milli-voltmeter, Weston DC model 1

Weston Electrical Instrument Corporation
1911
Sir William Thomson's multicellular voltmeter

Sir William Thomson's multicellular voltmeter

James White
circa 1890
standard milli-voltmeter

standard milli-voltmeter

Weston Electrical Instrument Corporation
circa 1925
switchboard meter

switchboard meter

Weston Electrical Instrument Corporation
circa 1920
voltmeter

voltmeter

Weston Electrical Instrument Corporation
circa 1908
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The Collection of Historical Scientific Instruments
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