Accession No

2601

Brief Description

standard Wattmeter, Duddell-Mather electrodynamometer type, by Robert W. Paul, English, 1902

Origin

England; London

Maker

Paul, Robert W.

Class

electrical

Earliest Date

1902

Latest Date

1902

Inscription Date

Material

wood; glass; metal.

Dimensions

height 245mm; base diameter 249mm resistance box length 310mm; breadth 141mm; height 107mm

Special Collection

Provenance

Donated by Imperial College, London, England, 1980.

Inscription

on top: “DUDDELL-MATHER STANDARD WATTMETER. / No. 15 PATENT / Robt. W .Paul, / London, N.”
on top (added) : “W 14”

Description Notes

Similar to Wh: 4264, but without thermometer on top.

A Duddell-Mather standard Wattmeter - a measuring instrument of the dynamometer type. A coil pivots within an outer fixed coil and the torque on the suspension is measured by a torsion head, which is moved over a scale of degrees until the electromagnetic force is balanced. One coil carries the current feeding the load; the other the current through a high resistance or ‘shunt’ connected across the load.

References

Events