Accession No

2315

Brief Description

electronic valve voltmeter, thermionic voltmeter, Moullin patent, by Cambridge Instrument Company Ltd., 1930

Origin

England; London

Maker

Cambridge Instrument Company Ltd.

Class

electrical

Earliest Date

1930

Latest Date

1930

Inscription Date

Material

plastic (ebonite); wood; glass; metal (brass)

Dimensions

length 264mm; breadth 200mm; height 112mm

Special Collection

Provenance

Donated by G.L. Campbell, 1977.

Inscription

‘VOLTS
CAMBRIDGE INSTRUMENT CO. LTD.
ENGLAND
No. L39767 (with logo)
PATT. MD’ (on dial)
‘CAMBRIDGE THERMIONIC VOLTMETER
MOULLIN PATTERN D.
PATENT APPLIED FOR’(on top)

Description Notes

Ebonite top on wooden box; four-sided arched, glazed window showing white dial; non-linear scale, 0 to 1.5 divisions; two pairs of brass terminals, marked ‘APPLIED POTENTIAL’ and ‘6 VOLTS’; zero adjustment and clamping controls below window; filament rheostat control and push-button switch on right side; two-position switch to change range. Blueprinted note fastened to front of box.
Similar to Wh: 3339.

Condition: fair (glss cracked, top heavily scratched); complete.

References

Events