Accession No

3335

Brief Description

moving iron, pointer frequency meter, by Crompton Parkinson Ltd., English, 1925-1950 (c)

Origin

England

Maker

Crompton Parkinson Ltd.

Class

electrical

Earliest Date

1925

Latest Date

1950

Inscription Date

Material

metal (brass, iron-alloy, other); glass; plastic

Dimensions

height 190mm; maximum diameter 185mm

Special Collection

Provenance

Transferred from Department of Engineering, University of Cambridge, Cambridge, England, 1986.

Inscription

‘CYCLES
CROMPTON PARKINSON
LIMITED.
724630 (with logo)
F.G.
200 V.
400 V.’ (on dial)

Description Notes

Cylindrical black metal case; three holes for wall mounting; two threaded brass terminals on back; glazed window on front showing white dial; non-linear scale, 40 to 60 cycles; iron-alloy disk pivoted between, and extending within two flat coaxial coils; coils are connected in parallel with each other, one with a capacitive, the other with an inductive reactance in series; this combination is connected across the meter terminals, in series with an inductor; vane for air damping. Plastic label fastened on back, giving instructions for use at either 200 V or 400 V.

References

Events