Accession No

3357

Brief Description

suspended coil AC Wattmeter, Siemens electrodynamometer type, ranges 0 to 20 amperes, 0 to 20 volts, by Siemens Brothers and Company, Dec. 1890

Origin

Maker

Siemens Brothers and Company

Class

electrical

Earliest Date

1890

Latest Date

1890

Inscription Date

Material

metal (brass); wood; paper; plastic (ebonite, ivorine)

Dimensions

height 405mm; breadth 210mm; depth 184mm

Special Collection

Provenance

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

Inscription

on second paper label on cover (added): “Checked 13. July 1921...”
on dial: “SIEMENS BROS. & CO. LTD. / LONDON”
on paper label on base (added): “Inst. No. 145”
on paper label tied to terminal: “...17.9.02”
on base: “5785”
on ivorine plate on base (added): “ENGINEERING LABORATORY / CAMB. UNIV.”

Description Notes

Similar to Wh: 3355, but designed as a Wattmeter with brass terminals for current and potential connections; plumb-bob; no mercury cups. Original paper label on cover largely illegible; second paper label added. Brass plate on base giving maxima for current and potential difference.

References

Events