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Campbell adjustable mutual inductance

Campbell adjustable mutual inductance

Robert W. Paul Instrument Company
1890-1920
current transformer

current transformer

Leeds & Northrup Company
circa 1910
current transformer

current transformer

General Electric Company
circa 1904
earth inductor

earth inductor

Harvard College
1873
earth inductor

earth inductor

Buff & Berger
1871-1898
earth inductor with stand

earth inductor with stand

Elliott Brothers
1893-1912
glass cylinder

glass cylinder

American
circa 1917
glass cylinder

glass cylinder

American
circa 1917
glass cylinder

glass cylinder

American
1900-1950
inductance coil

inductance coil

American
circa 1890
induction coil

induction coil

Radiation Laboratory of the Massachusetts Institute of Technology
circa 1915
LC resonant circuit with condensers and variable inductance

LC resonant circuit with condensers and variable inductance

Wireless Specialty Apparatus Company
circa 1908
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The Collection of Historical Scientific Instruments
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p. 617-495-2779 • f. 617-496-5794
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