Accession No

2114

Brief Description

Induction coil, Ruhmkorff type, 6-inch spark

Origin

433 Strand; London; England

Maker

APPS

Class

electrical

Earliest Date

1900

Latest Date

1910

Inscription Date

Material

wood; metal; brass; ebonite; ivory; ivorine; cloth

Dimensions

length 628mm; breadth 299mm; overall height 310mm

Special Collection

Provenance

Transferred from Institute of Astronomy, University of Cambridge, Cambridge, England, 10/1975.

Inscription

‘APPS
433 STRAND
LONDON
PATD. 1881.264.NO.1358’ (on ivorine plaque set in base)

Description Notes

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

Condition good; complete

References

Events