Accession No

3348

Brief Description

Decade rotary switch, Wheatstone Bridge, by W. G. Pye and Co. Ltd., English, 1955

Origin

England; Cambridge

Maker

W. G. Pye and Co. Ltd.

Class

electrical

Earliest Date

1955

Latest Date

1955

Inscription Date

Material

wood; plastic (ebonite); metal (brass, manganin); paper

Dimensions

length 445mm; breadth 300mm; height 185mm

Special Collection

Provenance

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

Inscription

“MANGANIN .02% / OHMS AT 20 C. / W.G.PYE & CO. LTD. CAMBRIDGE / (with logo) No. 28,570 / MADE IN ENGLAND”

Description Notes

Decade rotary switch Wheatstone Bridge; by W. G. Pye & Co., English, 1955.

Rectangular wooden box with hinged lid; ebonite top; eleven plated-brass terminals; two lockable tapping keys with ebonite tops; two four-position rotary switches for proportional coils (four pairs of 1, 10, 100, and 1 000 ohms); four eleven-position rotary switches for serial coils (0 to 1, 10, 100, and 1 000 ohms); all coils, except around switches on underside of top plate. Paper circuit diagram fastened to inside of lid. With ‘CERTIFICATE OF TEST’, dated 22-3-1955.

References

Events