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  • Terms: demonstration apparatus
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hydraulic ram model

hydraulic ram model

Central Scientific Company
1920-1940
Blackwood ballistic pendulum

Blackwood ballistic pendulum

Central Scientific Company
1940-1950
demonstration model of gasoline engine

demonstration model of gasoline engine

Central Scientific Company
circa 1920
cathode ray tube, Crookes style

cathode ray tube, Crookes style

German
circa 1940
cathode ray tube, Crookes style

cathode ray tube, Crookes style

German
circa 1940
Faraday wheel

Faraday wheel

Central Scientific Company
circa 1950
electric plume

electric plume

Central Scientific Company
circa 1941
moment of inertia apparatus

moment of inertia apparatus

Central Scientific Company
1930-1950
Frahm resonance gyroscope (or top)

Frahm resonance gyroscope (or top)

Central Scientific Company
1930-1950
Hartl optical disk

Hartl optical disk

Central Scientific Company
1930-1950
Pelton wheel water motor with scales (2)

Pelton wheel water motor with scales (2)

U.S. Gauge Company
circa 1929
alternating current motor demonstration (?)

alternating current motor demonstration (?)

Central Scientific Company
ca. 1910-1940
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