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ID number:  BIRRC-P0475
Institution:  Research and Cultural Collections
Named collection:  Collection of Historic Physics Instruments
Artist / Maker:  Weston Electrical Instrument Co.
Title / Object name:  AC and DC Ammeter
Object type:  Electrical instrument
Place made:  Newark, N.J., U.S.A.
Date made:  1922
Materials:  Metal meter mounted in polished wooden box with hinged lid
Measurements:  26 x 21 x 15 cm

This is a moving coil instrument using the electrodynamometer principle. The current passes both through the moving coil and through the windings of the magnet. This works for both direct and alternating currents but results in a very non-linear scale. There are two ranges 0 to 5 and 0 to 2.5 A and the maximum frequency is stated to be 133 Hz. Instructions and calibration certificate in lid dated 21 Sept. 1922. Cost £25.11.11. See also P0476.

Inscriptions / Translations:  On dial: WESTON AMMETER
A 19938
On body: WESTON
MODEL 370 No. 1842
Weston Electrical Instrument Co.,
Newark, N.J., U.S.A.
B’ham. Univ. Physics.

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