Variometer for Armstrong regenerative receiver

Variometer for Armstrong regenerative receiver

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Description
This is one of two tunable variable condensers used by Edwin Howard Armstrong in his first regenerative radio circuit in 1912. Turning the dial moves a set of plates inside the box in relation to a fixed set of plates. This changes the amount of charge stored in the electrical circuit and allows the listener to alter the received radio frequency.
Location
Currently not on view
Object Name
Capacitor, Variable
capacitor
variable condenser
Other Terms
Capacitor, Variable; Radio
Date made
1912
associated date
1912
associated person
Armstrong, Edwin Howard
maker
Armstrong, Edwin Howard
Measurements
overall: 7 1/4 in x 7 1/4 in x 7 1/2 in; 18.415 cm x 18.415 cm x 19.05 cm
ID Number
EM.314503.05
catalog number
314503.05
accession number
202631
Credit Line
from Marion Armstrong
See more items in
Work and Industry: Electricity
Data Source
National Museum of American History
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