Accession No

4088

Brief Description

phonic wheel, by Cambridge Instrument Company Ltd., English, 1928

Origin

England; Cambridge

Maker

Cambridge Instrument Company Ltd.

Class

medical; electrical

Earliest Date

1928

Latest Date

1928

Inscription Date

Material

metal (iron, brass, white metal); plastic (bakelite, two others); cloth

Dimensions

length 135mm; breadth 115mm; height 71mm

Special Collection

Cambridge Instrument Company Collection

Provenance

Donated by the Cambridge Instrument Company.

Inscription

Description Notes

Phonic wheel used as a time marker for ECG machine. Axle carries stroboscopic disc with five projecting pieces, and cogged wheel; disc spins between two electromagnets, which are powered through pair of brass terminals. Metal bar from one terminal protrudes over electromagnet and has adjustable brass strip which contacts with cogged wheel. Three brass terminals for starter motor; one furhter terminal (purpose unknown). Hole in iron support for positioning on clamp stand, held in place by knurled brass screw.

Condition fair; incomplete (starter motor missing)

References

Events