2009.ph.21.1: A black instrument (~23cm tall) consisting primarily of a black cylindrical body set on a wider cylindrical base. On the underside of the base are three adjustable leveling feet. On the upper front of the base are two electrical leads with plastic caps. At the front of the cylindrical body is a glass window through which the mirror of a galvanometer suspension is viewed. A knurled knob at the top of the instrument is used to adjust the mirror orientation, as well as to set and release a cradle for the suspension mirror.
The galvanometer includes the following additional consumables:
2009.ph.21.2: A small rectangular white cardboard box contains three fine metal elements needed to repair or replace the galvanometer suspension.
2009.ph.21.3 and 4: Two small brown envelopes, each of which a lens to be used in the galvanometer lens holder. Such lenses are meant to be used in conjunction with a lamp and scale apparatus
Accession Number: 2009.ph.21.1-4
Alternative Name:
Primary Materials: Metal, Plastic, Glass
On the top of the cylinder: “MADE IN U.S.A.” “ZERO ADJUSTER”, “COIL CLAMP”
On the rim of the base: “1708457”
Embossed on the base: “LEEDS & NORTHRUP CO., PHILADELPHIA, PA”
On a brass plaque on the back: “U. of T. PHYSICS No. 66 D31 053”
A white tag fixed to the base of the instrument includes the following calibration information. The values are handwritten in black ink:
“SENS .003 μA/ mm”
“C. D. R. X. 2200 [?]”
“PERIOD 3.5 sec”
“RESIS. 500 Ω”
“CAT. NO. 2500E”
The tag also includes the printed number “50798”
Dimensions (cm): Height = 22, Diameter = 13
Precision measurement of electrical current.
Excellent. The object appears to be in its original wrapping and shows no evidence of use.
Associated Instruments:
Leeds & Northrup Co., Philadelphia, Pennsylvania, USA
Date of Manufacture: c. 1960s
University of Toronto Department of Physics
Additional Information and References:
Historical Notes: