Ampere-Meter

Physics · University College

Accession Number: 2009.uc.15

Instrument Name: Ampere-Meter

Description:

This instrument has a cylindrical brass casing with flat glass cover. The face consists of a dial with brass centre and a silver-coloured indicator needle. The scale and backing are hand-drawn. A roughly quarter-circle scale, graduated in single units, is marked in tens “0″ through “50″ . There are two brass knobs on the left and right sides of the casing.

This item was found with a wooden base and backing, upon which it could be mounted (2009.uc.61), though it is likely that this backing was used for other ammeters as well.

Alternative Name: Ammeter, Amperes Meter

Primary Materials: Brass, Metal, Glass, Paper

Markings:

On the face of the instrument: “AMPERE-METER; Carpentier; no. 730; Recalibrated May 25th 1893 by J.S.P. Phys Lab’t'y Univ. of Toronto; Keep away from similar Instruments on all Magnets”

On the left-hand knob: “65″ Above this knob, there is “+”. Above the right hand knob, there is a “-”

Old Inventory Number = uc15.

Dimensions (cm): Diameter = 17.5 cm, Height = 12.5 cm

Function:

Measures electrical currents in Amperes.

Condition:

Good. The metal of the casing is marked and scored with use. The backing of the dial has been replaced with a hand-written backing.

Associated Instruments: 2009.uc.61

Manufacturer: J. Carpentier, Paris

Date of Manufacture: c. 1880

Provenance:

Additional Information and References:

For information on the manufacturer of this instrument, see this UTSIC blog post: “Jules Carpentier (1851-1921): A Modern Maker” by Erich Weidenhammer.

For information on J.S. Plaskett, the Department of Physics mechanician who recalibrated this instrument, see this UTSIC blog post: In Praise of Small Instruments: J.S. Plaskett, the Physical Laboratory Workshop, and the Humble Resistance Box by Ari Gross.

Donated to UTSIC: No

Historical Notes:

“J.S.P.” on the dial refers to J.S. Plaskett who was, in 1893, the mechanician at the University of Toronto Physics Department.