Accession No

2030

Brief Description

induction coil, Ruhmkorff type, by Harry W. Cox and Company Ltd., English, 1st 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; metal (brass); ebonite; ivorine

Dimensions

length 653; breadth 343mm; height 360mm

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
LONODON.’ (on ivorine plaque on base)
‘HARRY W COX LTD
LONDON’ (on interruptor plate)
‘PATENT NO 16926’ (on interruptor plate

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. Primary and secondary coils mounted on two ebonite standards and covered with ebonite sheet. Oscillating contact interruptor without Nieff hammer, mounted on ebonite plate.

Condition fair.

References

Events