Radio Instrument Co. radio power supply
date: label: date made
content: c 1922
label: date made
content: ca 1922
name: label: associated person
content: Dunmore
label: associated person
content: Lowell
label: maker
content: Radio Instrument Co.
notes: label: Description (Brief)
content: 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).
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from John B. Brady, thru Mrs. John B. Brady
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.321926.02
label: catalog number
content: 321926.02
label: accession number
content: 245709
objectType: label: Object Name
content: Rectifier Unit
label: Object Name
content: rectifier
label: Object Name
content: power supply
physicalDescription: label: Measurements
content: overall: 12 in x 8 3/4 in x 8 1/2 in; 30.48 cm x 22.225 cm x 21.59 cm