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2 inductance coils

2 inductance coils

American
late 19th-early 20th Century
apparatus for showing induction of the earth

apparatus for showing induction of the earth

Daniel Davis, Jr.
1848-1855
du Bois-Reymond-type inductorium

du Bois-Reymond-type inductorium

French
1890-1910
Elihu Thomson apparatus for showing the phenomena of alternating magnetic field

Elihu Thomson apparatus for showing the phenomena of alternating magnetic field

Ducretet et Lejeune
1892-1896
fixed coupled coils

fixed coupled coils

Paul Donaldson
circa 1927
fixed coupled coils

fixed coupled coils

Paul Donaldson
circa 1927
flat spiral (or ribbon) coil

flat spiral (or ribbon) coil

Daniel Davis, Jr.
1842-1855
flat spiral (or ribbon) coil

flat spiral (or ribbon) coil

Daniel Davis, Jr.
1842-1855
flat spiral (or ribbon) coil

flat spiral (or ribbon) coil

Daniel Davis, Jr.
1842-1855
Harvard-type inductorium

Harvard-type inductorium

Harvard Apparatus Company
1900-1930
inductance coil

inductance coil

American
1900-1930
inductance coil

inductance coil

American
circa 1920
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