Accession No

6565

Brief Description

Kelvin Bridge, by W. G. Pye and Company, English, mid-20th Century

Origin

England; Cambridge; Granta Works

Maker

W. G. Pye and Company Ltd.

Class

electrical; laboratory apparatus

Earliest Date

1946

Latest Date

1968

Inscription Date

Material

Wood (pine); plastic; metal (steel?, other); paper

Dimensions

430mm (width) x 165mm (height) x 295 mm (depth)

Special Collection

Provenance

Donated by an individual on or before 20/04/2010.

Inscription

[On interior of lid:]
“MADE IN ENGLAND
SCIENTIFIC PYE INSTRUMENTS
CAT NO 7415 SERIAL NO 67570
W.G. Pye & co. GRANTA WORKS CAMBRIDGE”

Description Notes

Kelvin Bridge, by W. G. Pye & Co., English, mid twentieth century.

Kelvin Bridge by W. G. Pye & Co.. Measures unknown low resistance in electrical circuits, typically under 1 ohm.

Two separate dials to control milliohms, one on the bottom left reaches up to 100 milliohms in 10 milliohm increments, and central one to allow precision ranging from 1 - 10 milliohms in 0.2 milliohm increments. Current switch in top left corner with three options: Normal, Off and Converse. Two identical screws below current switch to control current input. Range multiplier on the top right with five options, 0.01, 0.1, 1, 10, 100. Three Plugs on right side labelled “G1”, “S”, and “G2”. Two Galvanometer buttons, giving option of ‘initial’ and ‘final’. Two dials bottom centre, comprised both of two dials attached to each other are labelled “C”, “P”, “P1”, “C1”.

Circuit diagram on inside of lid, labelled “KELVIN BRIDGE CAT. NO 7415”

Accompanied by original typewritten instruction booklet in blue cover, A4, also by Pye & Co..

Condition: good; complete.

References

Events