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ID number:  BIRRC-P0568
Institution:  Research and Cultural Collections
Named collection:  Historic Physics Collection
Artist / Maker:  Weston Electrical Instrument Co.
Title / Object name:  Millivoltmeter - Laboratory standard
Object type:  Electrical instrument
Place made:  Newark, N.J., U.S.A.
Date made:  1922
Materials:  Various on polished wooden base
Measurements:  42 x 35.5 x 11.5 cm., Scale length 30.0 cm
BIRRC-P0568.jpg

This is a large moving-coil meter calibrated in millivolts. The terminals are marked + and 50 mV. There are three scales reading
0, 0.5, ...., 5; 0, 1, ...., 10; 0, 0.1, ...., 1. There are vernier type markings so that the scale can be read to 0.001 of full scale reading.
The instrument has a levelling bubble and built-in thermometer. It is mounted on a home-made levelling table.

Inscriptions / Translations:  Large brass plate:
WESTON DIRECT READING LABORATORY STANDARD MILLI-VOLTMETER
Weston Electrical Instrument Co,
Manufacturers, Newark, NJ, U.S.A.
Patented [list of numbers and dates from 1888 to 1890]
No. 1151
Marked on scale: Model 5 No. 1151

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