audio oscillator, 600-Hz
Date: 1925-1930
Inventory Number: WJ1235
Classification: Oscillator
Subject:
Maker: General Radio Company (1915-present)
Cultural Region:
Place of Origin:
Dimensions:
9 x 15.6 x 12 cm (3 9/16 x 6 1/8 x 4 3/4 in.)
Description:
This instrument consists of a wooden box on top of which a bakelite plate supports electrical connectors, two electromagnetic coils, a resonance cavity (or receiver), a tuning fork and an on-off dial. Two transformers take most of the space inside the box. The primary circuit requires a storage battery of 4-8 volts.
It is described in the General Radio Co. Bulletin 713 (January 1925) and was originally sold around $32.
It is described in the General Radio Co. Bulletin 713 (January 1925) and was originally sold around $32.
Signedfront plate: GENERAL RADIO CO. / CAMBRIDGE MASS.
Inscribedfront plate: 600 ~ / AUDIO OSCILLATOR / TYPE 213 SERIAL No 572
FunctionIt was used to generate tones of medium pitch, around 600 Hz (or 600 d.v./s).
Primary SourcesH. M. Halverson, "The Audio-Oscillator," The American Journal of Psychology 38, No. 2 (1927): 294-295.