Accession No

4260

Brief Description

inductor, Campbell variable mutual standard, by Robert W. Paul, English, 1914 (c)

Origin

England; London

Maker

Paul, Robert W.

Class

electrical

Earliest Date

1914

Latest Date

1914

Inscription Date

Material

wood; plastic (ebonite, ivorine); metal (brass)

Dimensions

length 362mm; breadth 250mm; height 199mm

Special Collection

Cambridge Instrument Company Collection

Provenance

Donated by the Cambridge Instrument Company.

Inscription

‘No. 123
TOTAL 100,000 MICROHENRIES
CAMPBELL VARIABLE MUTUAL STANDARD
Robt. W. Paul, London, N.’ (on ebonite top)

Description Notes

In wooden box, with 2-part top; ebonite part having mounted on it seven brass terminals and two rotary switches; wooden part with rectangular ivorine plate on which is marked a semi-circular scale; rotating ebonite pointer; inside the box are two fixed primary coils, and two fixed and one moving secondary coils.

Condition: good; complete.

References

Events