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Direct Current Ammeter


Square brown wooden ammeter covered in leather, which stands vertically. The instrument has a small semi-circular display scale ranging from 0-30 in tenths of an ampere with a glass surface. There are three metal terminals at the top labelled “+”, “-3”, and “-30”.

Accession Number: 2011.psy.32

Alternative Name:

Primary Materials: wood; leather, glass, metal


On the front, there is a University of Toronto paper label and a metal manufacturer’s brass label reading “N.C.S. Nalder Bros & Thompson Ltd.; Dir. Cur. Ammeter”. Another manufacturer’s label above the display scale reads “Chapman & Walker Ltd, Toronto, Canada; No. 92228”.

Dimensions (cm): Height = 22, Width = 9, Length = 17


An ammeter is a measuring instrument used to measure electric current in a circuit.


Poor. The leather is suffering from red rot (degradation process found in vegetable-tanned leather) all over.

Associated Instruments: 2011.psy.10, 2011.psy.33


Chapman & Walker Ltd, Toronto, Canada; N.C.S. Nalder Bros & Thompson Ltd.

Date of Manufacture:


Dept. of Psychology, University of Toronto

Additional Information and References:

Historical Notes: