CGR multiple frequency radio tuner
date: label: date made
content: 1918
name: label: associated user
content: unknown
label: associated institution
content: Bureau of Standards
label: maker
content: Compagnie Generale de Radiotelegraphie
notes: label: Description (Brief)
content: Lowell & Dunmore interference exhibit #56 tag on side; "[logo C.G.R.]" for Compagnie Générale de Radiotélégraphie, R961 written on top of side switch, side, top & back missing; "[2?]188" written on back of secondary condenser cover. French radio unit. Marked: "Patent. Office Interference Nos. 51204-21702-53153-53154-53155. Lowell & Dunmore Exhibit No. 56." Unit has a hard rubber or composition front panel. Case enclosure is missing and wooden base is broken from main unit. Circuit employs two primary coils with multi-point switching marked Primaire I and Primaire II on the front panel. A coupling control turns a square rotor coil in a variocoupler arrangement. All coils are of square type construction. An aperiodic secondary winding is varied inductively by the use of a tri-axial multipoint switching arrangement. Primary and secondary condensers are enclosed in metal containers and marked with 180o scales on the front panel. The multipoint inductance switches employ small rotary switches in a shunt arrangement which apparently offers additional inductance variation. A small porcelain-based single-throw/double-pole switch was placed on the unit after it was received by the Bureau of Standards. This specimen, together with other French radio apparatus, was brought to the Bureau during WWI by the French Radio Telegraph Mission, and was employed with a French amplifier or with the 1605-B amplifier (catalog number 321932). Reference: U.S. Patent Office" "Record and Testimony on Behalf of Lowell and Dunmore" (1928), page 501.
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.321934
label: catalog number
content: 321934
label: accession number
content: 245709
label: collector/donor number
content: R961
objectType: label: Object Name
content: Receiver
label: Object Name
content: radio receiver
label: Other Terms
content: Receiver; Radio
physicalDescription: label: Measurements
content: overall: 18 in x 25 in x 14 in; 45.72 cm x 63.5 cm x 35.56 cm