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Chaffee quenched spark gap

Chaffee quenched spark gap

Emory Leon Chaffee
1910-1911
demonstration National type A "Velvet Vernier" dial

demonstration National type A "Velvet Vernier" dial

National Company, Inc.
1924-1930
EAC R-390A / URR radio receiver

EAC R-390A / URR radio receiver

Electronic Assistance Corporation
1960-1965
electrical circuit and radio demonstration model

electrical circuit and radio demonstration model

Department of Physics, Harvard University
circa 1940
electrical circuit and radio demonstration model, part

electrical circuit and radio demonstration model, part

Department of Physics, Harvard University
circa 1940
electrical circuit and radio demonstration model, part

electrical circuit and radio demonstration model, part

Department of Physics, Harvard University
circa 1940
Hertz wave spark oscillator

Hertz wave spark oscillator

Jefferson Physical Laboratory, Harvard University
1890s
Hertz wave spark oscillator

Hertz wave spark oscillator

Jefferson Physical Laboratory, Harvard University
circa 1903
LC resonant circuit with condensers and variable inductance

LC resonant circuit with condensers and variable inductance

Wireless Specialty Apparatus Company
circa 1908
Leyden jar condenser

Leyden jar condenser

Wireless Specialty Apparatus Company
circa 1908
Leyden jar condenser

Leyden jar condenser

Wireless Specialty Apparatus Company
circa 1908
variometer

variometer

General Radio Company
circa 1920
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The Collection of Historical Scientific Instruments
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