Accession No

3325

Brief Description

moving magnet tangent galvanometer, Thomson graded type, by James White, Scottish, 1883

Origin

Scotland; Glasgow

Maker

White, James

Class

electrical

Earliest Date

1883

Latest Date

1883

Inscription Date

Material

wood; metal (brass, copper, magnet); glass (mirror)

Dimensions

box length 423mm; breadth 205mm; height 185mm

Special Collection

Provenance

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

Inscription

on base: “No.125”
on first dial box: “SIR WM THOMSON’S / PATENT / J. WHITE / GLASGOW / No. 25”
on second dial box: “...No. 142”
on magnet: “10.3 JANY. 17th / 83”
on dial boxes and base (added): “B.H.”
on base and carrying box (added): “Profr. B. Hopkinson / 1904

Description Notes

Rectangular wooden base with central V-groove and non-linear, stamped scale from ‘1/4’ to ‘44’ coil fixed in vertical plane at one end with copper bar connectors; two dial boxes ( to be used alternatively) with magnetic pointers slide along central groove; each dial box with glazed top window showing magnetic needle, scale marked from centralzero to ‘50’ on either side, and mirrored base; clamping screw; semi-circular bar magnet to be placed in vertical plane on sliding dial box; each dial box has circular spirit level and adjustable holder for magnet. In wooden carrying case with brass lock and handle

References

Events