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AC and DC voltmeter

AC and DC voltmeter

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

A.C. voltmeter

Jewell Electrical Instrument Company
1930-1960
A.C. voltmeter, 0-10, US Navy type

A.C. voltmeter, 0-10, US Navy type

General Electric Company
1945-1960
A.C. voltmeter, 0-125

A.C. voltmeter, 0-125

Weston Electrical Instrument Corporation
circa 1925
A.C. voltmeter, 0-125

A.C. voltmeter, 0-125

Jewell Electrical Instrument Company
1930-1950
A.C. voltmeter, General Electric Co.

A.C. voltmeter, General Electric Co.

General Electric Company
1909-1930
A.C. voltmeter, laboratory standard

A.C. voltmeter, laboratory standard

General Electric Company
late 19th-mid 20th Century
alternating current voltmeter

alternating current voltmeter

Department of Physics, Harvard University
1920-1930
alternating current voltmeter

alternating current voltmeter

American
1900-1930
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
D.C. voltmeter

D.C. voltmeter

Weston Electrical Instrument Corporation
1900-1930
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