beat frequency audio oscillator
Date: circa 1930
Inventory Number: WJ0618
Classification: Oscillator
Subject:
Manufacturer: General Radio Company (1915-present)
Cultural Region:
Place of Origin:
Dimensions:
25 × 55 × 28.4 cm (9 13/16 × 21 5/8 × 11 3/16 in.)
box: 25.4 × 50.2 × 31.1 cm (10 × 19 3/4 × 12 1/4 in.)
Description:
Several switches, knobs and dials are used to adjust the output frequency signals. The right dial is a cycles increment dial, useful for obtaining accurate settings at very low frequencies and for obtaining frequencies in the range between 0 and 20 cycles, which are not indicated on the main dial. The latter provides a true logarithmic increase in frequency with angular rotation over the range from 20 to 11,000 cycles per second.
The instrument runs on batteries, which are stored inside. Two handles, one on each side, are used to move this heavy device.
The instrument runs on batteries, which are stored inside. Two handles, one on each side, are used to move this heavy device.
Signedon front panel: GENERAL RADIO CO.
ProvenancePsychology Department, William James Hall, Harvard University.