Accession No

1348

Brief Description

set of three standard resistors, British Association pattern, 1, 10,and 100 ohms, by Elliott Brothers, English, 2nd 1/2 19th Century

Origin

England; London

Maker

Elliott Brothers

Class

electrical

Earliest Date

1850

Latest Date

1900

Inscription Date

Material

metal (brass, copper); plastic (ebonite)

Dimensions

1348.1 length 243mm; breadth 59mm; height 215mm 1348.2 length 239mm; breadth 69mm; height 215mm 1348.3 length 240mm; breadth 69mm; height 214mm

Special Collection

Cavendish Collection?

Provenance

Transferred from the Cavendish Laboratory, University of Cambridge.

Inscription

on block (all): “ELLIOT BROS. / LONDON”
on block (1348.1): “1 LEGAL OHM / AT 16 C / No. 155”
on block (1348.1; added): “E. 308”
on block (1348.2): “10 LEGAL OHMS / AT 16C / No. 156”
on block (1348.2; added): “E. 310”
on block (1348.3): “100 LEGAL OHMS / AT 16.8 C / No. 159”
on block ( 1348.3; added): “E.312”

Description Notes

Circular ebonite top; two parallel copper rod connectors passing through top are bent (twice) to vertical, and held in place by ebonite block; wire wound on brass bobbin fixed to second circular ebonite plate; enclosed in stepped-diameter cylindrical brass case, not fixed by screws; thermometer hole passes through centre of case.

References

Events