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'Marconi' Direction Finder Type 11F, by Marconi Company, London, c. 1920

Inventory Number 75339

Acknowledgement: © History of Science Museum, University of Oxford, inv.75339

Item type
Object
Provenance
Presented by the Marconi Corporation.
Primary inscriptions
"'MARCONI' / DIRECTION FINDER / TYPE 11.F. / P.S. No. 1977 A / INST. No 356478 / MARCONI'S WIRELESS TELEGRAPH CO. LTD." printed on metal plaque on front exterior surface. See Documents for other inscriptions.
Other inscriptions
"INST. No 356210 P.S. No 1973 A" printed on upper vertical panel. "INST No 355873 P.S. No 1974 A" printed on radiogoniometer panel. "INST No 355570 P.S. No 1975 A" printed on tuning condenser panel. "EARTHING RELAY / INST. No 359645 P.S. No 9280" printed on earthing relay panel. "CALIBRATING CHOKE / INST. No 356892 P.S. No. 1976 A" printed on calibrating choke panel.
Object type
Radio communication
Dimensions
Height: 470mm Width: 440mm Depth: 300mm
Inventory No
75339
Accession Number
2004-9/577

Description

Marconi' Direction Finder Type 11F, with assorted vertical and sloped ebonite panels, in a dovetailed teak case. With seven DEV/Q valves, note magnifier switch, and filaments control upon upper vertical surface. With glazed-top radiogoniometer (scale 0-360) and tuning condenser dial (scale 0-10), parallel condenser switch, DF sense switch, upon central sloping ebonite and white plastic(?) panel. With earthing relay and calibrating choke ebonite sections upon lower vertical section. With four plugs, two nickel-plated terminals (marked "DF1", "DF2"), and a bank of five nickel-plated terminals (marked "EARTH", "PORT", "STBD.", "AFT", "FORE" respectively) on left hand side exterior surface of case. With a bank of five nickel-plated terminals (marked "SWITCH", "4V+", "6V+", "COMM", "HT+" respectively) upon right hand side exterior surface of case.

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