Accession No

3323

Brief Description

Portable, pivoted coil, pointer AC-DC Ammeter, electrodynamometer type, dynamometer milliammeter, range 0 to 20 milliamperes, by Cambridge Instrument Company Ltd., English, 1950

Origin

England; London

Maker

Cambridge Instrument Company Ltd.

Class

electrical

Earliest Date

1950

Latest Date

1950

Inscription Date

Material

plastic (ebonite); glass (mirror); metal (brass, lead); wood; paper; hide (leather)

Dimensions

length 329mm; breadth 320mm; height 150mm

Special Collection

Cambridge Instrument Company

Provenance

Transferred from Department of Engineering, University of Cambridge, Cambridge, England, 1986.

Inscription

on dial: “CAMBRIDGE DYNAMOMETER MILLIAMMETER / B.S.S. 89. GRADE SS No. L 240601 / CAMBRIDGE / INSTRUMENT CO. LTD. / ENGLAND.”
Below dial: “CAMBRIDGE / INSTRUMENT CO LTD / ENGLAND (with logo)”
On shunt: “SHUNT FOR / INST. No. L 240601

Description Notes

Ebonite top; glazed window showing white dial and mirror; two non-linear scales, each 0 to 20 divisions; four ebonite and brass terminals above and to right of window; zero adjustment screw below; multiplier shunt with two terminals, fuse box, and six-position rotary switch mounted on right side of box, with twisted insulated lead wires; in wooden box with lid and leather carrying strap. Paper screwed to inside of lid, with typed specifications. Certificate of Test paper, dated 5.4.50.

References

Events