Accession No

4066

Brief Description

Duddel-Mather anti-capacity gauze resistance (pattern A), by Cambridge Instrument Company Ltd., 1925

Origin

England; London

Maker

Cambridge Instrument Company Ltd.

Class

electrical

Earliest Date

1925

Latest Date

1925

Inscription Date

Material

wood; metal (brass, at least 1 other); plastic (ebonite, bakelite)

Dimensions

depth 322mm; breadth 280mm; height 350mm

Special Collection

Cambridge Instrument Company Collection

Provenance

Donated by the Cambridge Instrument Company.

Inscription

‘DUDDEL-MATHER PATENT
ANTI-CAPACITY GAUZE RESISTANCE’ (top)
‘Cambridge Instrument Co. Ltd., England.
nO L-14777’ (on top)

Description Notes

Rectangular wooden box with brass carrying handles. Ebonite and metal grid top. Metal grids cover ventilation holes on 2 sides and bottom. 2 ebonite handled brass plugs fit 5 holes in the top of the instrument for adjusting the resistance value. [If identical to 4325 then: inside has 2 rows of 5 ebonite rods fastened to underside of top plates supporting a 7-inch wide ribbon of constantan wire, silk-covered and woven with silk thread. Terminals connect at end and intermediate points of resistive ribbon, hence providing 2 resistances].

Condition good; complete

References

Events