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AC and DC voltmeter

AC and DC voltmeter

Stanley Electric Manufacturing Company
1890-1905
A. C. voltmeter

A. C. voltmeter

Nalder Brothers & Company
1884-1920
A.C. voltmeter, laboratory standard

A.C. voltmeter, laboratory standard

General Electric Company
late 19th-mid 20th Century
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
Lord Kelvin's multicellular voltmeter

Lord Kelvin's multicellular voltmeter

James White
circa 1890
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, direct reading laboratory standard

milli-voltmeter, direct reading laboratory standard

Weston Electrical Instrument Corporation
late 19th Century
milli-voltmeter, Weston DC model 1

milli-voltmeter, Weston DC model 1

Weston Electrical Instrument Corporation
1911
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