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direct current voltmeter

direct current voltmeter

Deprez et Carpentier
1890-1910
Edison system ampere meter (A.C.)

Edison system ampere meter (A.C.)

General Electric Company
1893-1900
Halls Jumbo telephone

Halls Jumbo telephone

Thomas Hall
circa 1874
larger shunt for millivoltmeter

larger shunt for millivoltmeter

Weston Electrical Instrument Corporation
1910-1917
moving coil galvanometer

moving coil galvanometer

Robert W. Paul Instrument Company
circa 1910
pointer galvanometer

pointer galvanometer

Leeds & Northrup Company
1930-1950
resistance standard (0.01 Ohm)

resistance standard (0.01 Ohm)

Otto Wolff
circa 1903
resistance standard (1 ohm)

resistance standard (1 ohm)

Leeds & Northrup Company
1926-1929
resistance standard (1 ohm)

resistance standard (1 ohm)

Leeds & Northrup Company
1926-1929
resistance standard (10 ohms)

resistance standard (10 ohms)

Leeds & Northrup Company
1926-1929
resistance standard (10 ohms)

resistance standard (10 ohms)

Leeds & Northrup Company
1926-1929
smaller shunt for millivoltmeter

smaller shunt for millivoltmeter

Weston Electrical Instrument Corporation
1900-1917
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The Collection of Historical Scientific Instruments
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