oscillator coils
Inventory NumberRS0847
ClassificationOscillator Coils
Subject
Maker
General Radio Company
1915-present
User
Cruft Laboratory, Harvard University
founded 1914
Cultural Region
Place of Origin
Dimensions20 x 48 x 25 cm, 8 lb. (7 7/8 x 18 7/8 x 9 13/16 in., 3.6 kg)
Material
DescriptionMounted on rectangular wooden board. Cylindrical spool with twisted wires wrapped around it. Rectangular black panel mounted on top.
Signedetched and white filled: OSCILLATOR COIL / CRUFT LABORATORY / TYPE B No. 3
FunctionThe frequency of transmission or reception of a radio circuit is inversely proportional to the square root of both its capacitance and inductance. Tuning coils are one of the methods used to alter a circuit's frequency, by altering the circuit's inductance.
In this particular case, the inductance of the coil (which would be part of the circuit) is changed by adjusting one of the switches on the side, which makes one of the points of electric contact move along the coil wires, changing the effective size of the coil. Less loops and wire between the two electric contacts means a smaller inductance.
In this particular case, the inductance of the coil (which would be part of the circuit) is changed by adjusting one of the switches on the side, which makes one of the points of electric contact move along the coil wires, changing the effective size of the coil. Less loops and wire between the two electric contacts means a smaller inductance.
ProvenanceFrom the Cruft Laboratory, Harvard University.
Historical AttributesCruft
Date: 1890-1930
Object number: RS0528
General Radio Company
Date: circa 1935
Accessories: power cord
Object number: 1997-1-0355
