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Acme mounted rectifier, oscillator, and vacuum tube for teaching

Acme mounted rectifier, oscillator, and vacuum tube for teaching

ACME Apparatus Company
circa 1920
Chaffee quenched spark gap

Chaffee quenched spark gap

Emory Leon Chaffee
1910-1911
Chaffee quenched spark gap

Chaffee quenched spark gap

Emory Leon Chaffee
1911-1912
Chaffee quenched spark gap, oil-filled

Chaffee quenched spark gap, oil-filled

Emory Leon Chaffee
1911-1912
Chaffee quenched spark gap, oil-filled

Chaffee quenched spark gap, oil-filled

Emory Leon Chaffee
1911-1912
Chaffe quenched spark gap, earliest water-cooled form

Chaffe quenched spark gap, earliest water-cooled form

Emory Leon Chaffee
1910
Clapp-Eastham Blitzen type L high tension transformer

Clapp-Eastham Blitzen type L high tension transformer

Clapp-Eastham Company
circa 1910
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
Leyden jar condenser set

Leyden jar condenser set

Wireless Specialty Apparatus Company
circa 1908-1909
radio wavemeter and Kolster decremeter type CN1215

radio wavemeter and Kolster decremeter type CN1215

National Electric Supply Company
circa 1918
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The Collection of Historical Scientific Instruments
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