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AC ammeter

AC ammeter

Weston Electrical Instrument Corporation
circa 1930
AC ammeter

AC ammeter

Weston Electrical Instrument Corporation
circa 1900
A.C. ammeter, 0-30

A.C. ammeter, 0-30

Jewell Electrical Instrument Company
1920-1930
AC mil-ammeter

AC mil-ammeter

Weston Electrical Instrument Corporation
circa 1900
ammeter

ammeter

Deprez et Carpentier
circa 1890
ammeter

ammeter

A. K. Eaton
1884-1890
ammeter

ammeter

Weston Electrical Instrument Corporation
1910-1920
ammeter

ammeter

General Electric Company
1910-1920
ammeter for use with Zeiss photomicrographic apparatus

ammeter for use with Zeiss photomicrographic apparatus

Weston Electrical Instrument Corporation
circa 1920
ammeter with strip chart recorder

ammeter with strip chart recorder

John B. Little
1950-1960
ammeter with strip chart recorder

ammeter with strip chart recorder

Harvard Cyclotron Laboratory
1948
Ayrton & Pemy's direct reading spring ammeter

Ayrton & Pemy's direct reading spring ammeter

Latimer Clark, Muirhead & Company, Ltd.
1883-1890
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