Direct Current Ammeter

Psychology

Accession Number: 2011.psy.32

Instrument Name: Direct Current Ammeter

Description:

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″.

Alternative Name:

Primary Materials: wood; leather, glass, metal

Markings:

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

Function:

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

Condition:

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

Manufacturer:

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

Date of Manufacture:

Provenance:

Dept. of Psychology, University of Toronto

Donated to UTSIC: No

Historical Notes: