Accession Number: 2009.ph.21
The object is black and cylindrical. It has a circular tripod base; each of the feet can be adjusted for stabilization. Rising vertically from this is a cylinder with a glass window at the front through which a filament and a round mirror is visible. At the base of the mirror are two cylindrical knobs, one with a asterisk-shaped label. On the top of the cylinder there are two upright connectors, one labelled “ZERO ADJUSTER”, the other “COIL CLAMP.”9
The instrument wrapped in a plastic bag which also contains two small brown envelopes and a small rectangular box.
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”
Dimensions (cm): Height = 22cm, Diameter = 13
Precision measurement of electrical current.
Excellent. The object appears to be in its original wrapping and shows no evidence of use.
2009.ph.10; 2009.ph.176; 2009.ph.177; 2009.ph.178; 2015.ph.638; 2015.ph.664; 2015.ph.665
Leeds & Northrup Co., Philadelphia, Pennsylvania, USA
Date of Manufacture: c. 1960s
University of Toronto Department of Physics
Instructions for use can be found here on the website of the Robert A. Paselk Scientific Instrument Museum, part of the Humboldt State University [Accessed 30 October, 2016].