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1amp shunt

1amp shunt

Weston Electrical Instrument Corporation
circa 1912
3 stage audio amplifier

3 stage audio amplifier

General Radio Company
5 amp shunt

5 amp shunt

Weston Electrical Instrument Corporation
circa 1912
10 amp shunt

10 amp shunt

Weston Electrical Instrument Corporation
circa 1912
100 amp shunt

100 amp shunt

Weston Electrical Instrument Corporation
circa 1912
1000 amp shunt

1000 amp shunt

Weston Electrical Instrument Corporation
circa 1912
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
ammeter

ammeter

General Electric Company
1910-1920
artificial horizon with mercury, triangular roof

artificial horizon with mercury, triangular roof

American
late 19th century
Audio instrument, oscillator. Large rectangular body, wood frame on sides, black front panel and decorative grill on to pand back. On front panel, large dials, circular window for meter, pair of electrical connectors, indicator light and switches.

Audio instrument, oscillator. Large rectangular body, wood frame on sides, black front panel and decorative grill on to pand back. On front panel, large dials, circular window for meter, pair of electrical connectors, indicator light and switches.

General Radio Company
1939
audio oscillator, 600-Hz

audio oscillator, 600-Hz

General Radio Company
1925-1930
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