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ID number:  BIRRC-P0115
Institution:  Research and Cultural Collections
Named collection:  Historic Physics Collection
Artist / Maker:  Believed to be Siemens
Title / Object name:  Wattmeter
Object type:  Electrical instrument
Place made:  Probably Berlin
Date made:  1902
Materials:  Mounted in wood and with wooden storage case
Measurements:  Meter: 28 x 20 x 12 cm Case: 32.5 x 25 x 15 cm

A wattmeter measures the power dissipated in an electrical component. Connections are made to measure simultaneously the current flowing through and the p.d. across the component. This is a moving coil instrument of high quality and has a linear scale of 0 to 150 units. The range can be changed by inserting various plugs. Handwritten instructions and corrections dated Berlin 3 December 1902 are given in the lid of the box.
Part of Oliver Lodge Collection.

Inscriptions / Translations:  Precision-Wattmeter
Max. E.M.F. 30 Volts
Max. current 25 Amp.
Serial no 73600

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