audio oscillator
Datecirca 1930
Inventory NumberRS0198
ClassificationSignal Generator
Subject
Maker
General Radio Company
1915-present
Cultural Region
Place of Origin
Dimensions8 x 16 x 12 cm (3 1/8 x 6 5/16 x 4 3/4 in.)
Material
DescriptionA General Radio Co.-Cruft audio oscillator mounted on wooden box with a bakelite plate.
See Inventory Number: WJ1235
See Inventory Number: WJ1235
SignedEtched and white filled on plate on side: 1000~ / AUDIO OSCILLATOR / TYPE 213 SERIAL No 258 / GENERAL RADIO COMPANY / CAMBRIDGE, MASS.
FunctionPossible function: The Type 126 General Radio Capacitance Bridge was designed to measure capacitances as low as a few picofarads to a precision of at least 0.1%...
An external 1000 Hz oscillator, such as a General Radio Type 213 Audio Oscillator, is used to drive the bridge.
http://physics.kenyon.edu/EarlyApparatus/Electrical_Measurements/Capacitance_Bridge/Capacitance_Bridge.html
An external 1000 Hz oscillator, such as a General Radio Type 213 Audio Oscillator, is used to drive the bridge.
http://physics.kenyon.edu/EarlyApparatus/Electrical_Measurements/Capacitance_Bridge/Capacitance_Bridge.html
Historical AttributesCruft
General Radio Company
Date: 1939
Object number: RS0452
General Radio Company
Date: circa 1943
Object number: 1997-1-0362
General Radio Company
Date: before 1960
Accessories: Power cord and patch cord, bound together.
Object number: 2002-1-0068
