Milliammeter

Psychology

Accession Number: 2011.psy.10

Instrument Name: Milliammeter

Description:

A square wooden box with a scale on the front behind a glass window showing milliamperes (0-150). It has a leather brown strap on the right hand side. There are burgundy and black knobs on the top. A circular metal engraved label attached on the front reads: “CAUTION: Magnetic Fields may damage this meter. DO NOT PLACE IT ON OR NEAR A DYNAMO OR MOTOR”

Alternative Name: Milli-ampere meter

Primary Materials: Wood, Plastic, Leather

Markings:

The instrument is a registered trade-marked ‘MEGGER,’ No 341951. Printed above the scale: “Made in England by Evershed and Vignoles Ltd.” Printed below the scale: “F.G. No. 341951″.

Dimensions (cm): Height = 5.5, Width = 15.5, Length = 11

Function:

An instrument for measuring small electric currents, calibrated in milliamperes.

Condition:

Excellent. Slight rip and cracking of leather strap.

Associated Instruments: 2011.psy.32, 2011.psy.33

Manufacturer: Evershed & Vignoles Ltd., England

Date of Manufacture: Early 20th century

Provenance:

Dept. of Psychology, University of Toronto

Donated to UTSIC: No

Historical Notes:

Sydney Evershed and Ernerst Vignoles founded Evershed & Vignoles Ltd on February 5th 1895. They constructed the first portable insulation tester. The MEGaohm metER was then named a MEGGER, which became a trademark name in 1903.
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