Radio Instrument Co. radio power supply

Radio Instrument Co. radio power supply

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Description (Brief)
Used in Supreme Court case, 1935. Marked: BS31247; tags: (1) In the U.S. Pat. Office Interference Nos. 51204-21702-53153-53154-53155. Lowell & Dunmore Exhibit No. 46. (2) U.S. District Court District of Delaware Plaintiffs Exhibit No. 67. (3) Supreme Court of the U.S., Oct. Term 1935, Plaintiffs--Respondents Exhibit no. 20. Bureau of Standards. No.: R-597. Rectifier unit was employed as the power supply for the A.C. operated receiver (Cat. #321925). Rectifying tube is a UV201-A with grid and plate tied together to form a diode. Transformer contains five windings, one supplying 6 volts AC to the rectifier filament, one supplying 6 volts to receiving tube filaments, one supplying 300 volts for filtering and use as plate voltage, and one supplying four volts to the filament of a "Tungar" rectifier tube. The 110 volt input or primary winding was tapped to furnish plate voltage to the "Tungar" gas rectifier. This latter tube supplied DC current to the filed coil of a Magnavox speaker. In this case, the choke employed for filtering purposes was the twin filed coil of the Kolster Arc. (Cat. No. 321936) Reference: Bureau of Standards "Scientific Paper No. 450" (1922).
Location
Currently not on view
Object Name
Rectifier Unit
rectifier
power supply
date made
c 1922
ca 1922
associated person
Dunmore
Lowell
maker
Radio Instrument Co.
Measurements
overall: 12 in x 8 3/4 in x 8 1/2 in; 30.48 cm x 22.225 cm x 21.59 cm
ID Number
EM.321926.02
catalog number
321926.02
accession number
245709
Credit Line
from John B. Brady, thru Mrs. John B. Brady
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Work and Industry: Electricity
Data Source
National Museum of American History
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