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Manganin Coils Dial Bridge, by W.G. Pye & Company, Cambridge, Probably 1920s

Inventory Number 31104

Acknowledgement: © History of Science Museum, University of Oxford, inv.31104

Subject
Sundials
Item type
Object
Provenance
Transferred from the University Laboratory of Physiology, Oxford, in 2005, per Professor David Paterson.
Primary inscriptions
"MANGANIN COILS OHMS AT 17° CENT / W.G.PYE & CO. / ENG. / CAMBRIDGE / No 7306" printed on upper exterior surface. "W. G. PYE & CO. CAMBRIDGE / DIAL BRIDGE No 7440-6" printed on celluloid plaque attached to side of case.
Object type
Dial
Dimensions
Height: 135mm Width: 408mm Depth: 198mm Weight: 5.25kg
Inventory No
31104
Accession Number
2013-27/part

Description

Manganin Coils Dial Bridge, with ebonite upper surface, upon teak case. Upper surface lacking screws and so can be removed to reveal various small metal coils on underside, connecting to assorted dials upon upper surface. With six main bakelite dials: four scaled 0-10 and marked "THOUSANDS", "HUNDREDS", "TENS", and "UNITS" respectively. With two upper dials scaled "1000, 100, 10, 1" and "1, 10, 100, 1000" respectively. With various lacquered brass terminals upon upper ebonite surface. With four terminal pairs, marked "For Balancing Resistance", "G1" & "G2", "B1" & "B2", and one pair unmarked; two of these pairs are interjoined with copper connectors. With three individual terminals, marked "SERIES", "SERIES" and "x" respectively. With printed cellouloid plaque upon side of case with circuit diagram marked "DIAL BRIDGE".

Manganin is the alloy of which the wires are made.

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