Accession Number: 2009.uc.15
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
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
Measures electrical currents in Amperes.
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
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.
“J.S.P.” on the dial refers to J.S. Plaskett who was, in 1893, the mechanician at the University of Toronto Physics Department.