Accession No

2031

Brief Description

induction coil, Ruhmkorff type, 7-inch spark, by Harry W. Cox and Company Ltd., English, 1/4 20th Century

Origin

England; London; 47 Gray’s Inn Road

Maker

Harry W. Cox and Company Ltd.

Class

electrical

Earliest Date

1900

Latest Date

1925

Inscription Date

Material

wood; ebonite; metal (brass); ivorine

Dimensions

length 635mm; breadth 315mm; height 330mm

Special Collection

Cavendish collection

Provenance

Transferred from Cavendish Laboratory, University of Cambridge, 1974.

Inscription

‘HARRY W. COX & CO LTD
ACTUAL MAKERS OF X RAY &
ELECTRO THERAPEUTIC APPARATUS
47 GRAY’S INN ROAD
LONDON.’ (ivorine plaque on base)

Description Notes

Rectangular wooden box containing capacitor. Two pairs of brass terminals marked ‘Mercury break’ and ‘BATTERY’ respectively. Two-position ebonite and brass switch. Ebonite and brass discharge rods on two ebonite pillars (rods missing and pillars broken). Primary and secondary coils mounted on two ebonite standards and covered with ebonite sheet. Oscillating Nieff-hammer contact interruptor with adjustment screws, mounted on brass pillar.

Condition poor (both discharge rod pillars broken; coil covering broken); incomplete (both discharge rods and pillars missing).

References

Events