Accession No

3347

Brief Description

portable, pivoted coil, pointer AC Voltmeter and Wattmeter, Sumpner electrodynamometer type, voltage ranges 0 to 100 and 200 volts, by the General Electric Company, English, 1908

Origin

England; Salford

Maker

General Electric Company Ltd.

Class

electrical

Earliest Date

1908

Latest Date

1908

Inscription Date

1908

Material

plastic (ebonite, Bakelite); glass (mirror); metal (silver); wood; paper

Dimensions

length 365mm; breadth 261mm; height 154mm

Special Collection

Provenance

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

Inscription

on dial: “101W”
on top: “PORTABLE STANDARD WATTMETER / SUMPNER’S PATENT / No. 20605 1904 / TRADE MARK (with logo) / THE GENERAL ELECTRIC COMPANY CO. LTD. / SALFORD”
on outside of lid: “ FOR / AC / ONLY / 156”

Description Notes

Two-part ebonite top with glazed window showing silvered dial with mirror; two non-linear scales, ‘WATTS’ and ‘VOLTS’, each with 0 to 100 divisions; bakelite fuse holder and needle clamping device; lower part of top has two pair of ebonite covered terminals and two, two-position rotary switches. In wooden box with hinged lid and metal and wood handle; blue-printed diagram and specification sheet inside lid is signed and dated ‘2nd June, 1908’.

References

Events