Accession No

2029

Brief Description

induction coil, Ruhmkorff type, 7-inch spark, by APPS, English, 1896

Origin

England; London; 433 Strand

Maker

APPS

Class

electrical

Earliest Date

1896

Latest Date

1896

Inscription Date

Material

wood (ebonite); metal (brass, other); ivory

Dimensions

length 436mm; breadth 235mm; height 235mm

Special Collection

Cavendish

Provenance

Transferred from Cavendish Laboratory, University of Cambridge, 1974.

Inscription

‘1193
APPS
433 STRAND
LONDON
PATD. 1881-264’ (ivory plate on base)

Description Notes

Rectangular wooden base containing capacitor. Four pairs of brass terminals, two with shorting rods. Three-position ivory and brass commutator switch. Discharge rods with ivory handles mounted on two ebonite pillars. Primary and secondary coils mounted on two ebonite standards, and covered with ebonite sheath (slightly cracked). Oscillating Nieff hammer contact interruptor with adjustment screws mounted on brass pillar.

Condition good (sheath cracked); complete

References

Events