Accession No

3330

Brief Description

plug-type decade Wheatstone bridge, by Cambridge Scientific Instrument Company Ltd., English, c. 1903

Origin

Cambridge; England

Maker

Cambridge Scientific Instrument Company Ltd.

Class

electrical

Earliest Date

1903

Latest Date

1929

Inscription Date

1929

Material

wood; metal (brass, iron, copper); plastic (ebonite); paper

Dimensions

length 1020mm; height 265mm; breadth 314mm

Special Collection

Provenance

Transferred from Department of Engineering, University of Cambridge, Cambridge, England, 01/1986.

Inscription

‘Cambridge Scientific Instrument CO lTD ENGLAND. NO 2208. NO 1919.’ (top)

Description Notes

Rectangular wooden box with ebonite top; six brass terminals; brass block with plug receptors; five decades for series coils (0.1 - 0.9; 0 - 9; 0 - 90; 0 - 900; 0 - 9000) and five pairs of proportional coils (1, 10, 100, 1000, 10 000 ohms). Brass and ebonite plugs.

Wooden case with iron handles and brass hinges. Paper instructions in lid headed ‘Standard Wheatstone Bridge. Cambridge Instrument Company Ltd No. L2208’. The papers provide tables of true values of resistance at 20˚ C and ratio corrections by parts in 100,000. Second label is a certificate of test and bears the date 6/11/29.

Condition good; complete

References

Events