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Adjustable Gap Transformer (Experimental Model or Prototype), by Elliott Brothers (London) Ltd., ?1950s/60s

Inventory Number: 13440
Object Type:
Accession Number: 2003-11
Brief Description: A pair of plyers adapted as an experimental or prototype electrical instrument. A current transformer is used with an ammeter or power meter to obtain measurements of the alternating current in a conducting cable or busbar. The two arms compress against a coil spring thus opening to clip round a cable or busbar conductor. The pincer heads carry insulated coils with two flexible flying leads, one red/white, one blue/white, to spade connectors. The gap in the laminated core is controlled by a screw through one of the pincer heads. An indicator is visible through a small circular glazed aperture and shows small circles of yellow, green and red as the screw is turned. The '50' refers to the frequency but has been misread as a current in amperes. The finish appears to be black enamel. The handwritten label tied to it reads: 'Research sample. Adjustable gap Transf 50, 10 5 & 2.5 Amp Pre Shotter Patent not put into Production'. See descriptive note by H. R. Bristow.
Primary Inscriptions: Signed on one arm: 'ELLIOTT BROTHERS (LONDON) LTD'.
Provenance: Presented by the Marconi Corporation in 2003. Elliott Collection 1018.
Collection Group: Elliott Collection
Material(s): metal
Height Width Depth Diameter Unit
200 102 33 mm