Accession No

4093

Brief Description

Duddell-Mather standard wattmeter, by Cambridge and Paul Instrument Company Ltd., English, 1923

Origin

England; London

Maker

Cambridge and Paul Instrument Company Ltd.

Class

electrical

Earliest Date

1923

Latest Date

1923

Inscription Date

Material

wood (mahogany); glass; metal (brass, oxidised brass, copper); plastic (ebonite, bakelite)

Dimensions

length 785mm; breadth 590mm; height 395mm

Special Collection

Cambridge Instrument Company Collection

Provenance

Donated by the Cambridge Instrument Company.

Inscription

‘DUDDELL-MATHER STANDARD WATTMETER.
NO L-7697
Cambridge and Paul Instrument Co. Ltd. England’

Description Notes

Mahogany box set on 4 brass levelling feet. One end of the box carries a brass resistance bridge with plug-type connections (some missing); two brass terminals at one end. The other end of the instrument carries glazed mahogany box containing the main part of the wattmeter. On the top carries dial divided 0 - [100], numbered by 2, subdivided to 0.2; also carries mercury-in-glass thermometer divided 10˚C - [45˚C], numbered by 10˚C, subdivided to 1˚C; central plastic disc marked ‘remove to set zero’.

Condition fair (one of the glazed panels has come away from the box); incomplete.

References

Events