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The Siemens electrodynamometer was developed by the German physicist, Werner von Siemens, in 1880, and used for measuring either direct or alternating electric current. The form was widely used until the 1920s when it was replaced by the more convenient direct reading meter patented by Edward Weston. The inscription on this example reads “Queen & Co. Makers Phila.”
Ref: Alfred W. Wiener, “Electrodynamometers,” in Electric Power 8 (July 1895): 111-113.
James W. Queen & Co., Catalog of Electrical Testing Apparatus (Philadelphia, 1887), p. 11.
Currently not on view
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overall: 32 cm x 19.5 cm; 12 19/32 in x 7 11/16 in
overall: 11 9/16 in x 8 1/2 in x 8 in; 29.36875 cm x 21.59 cm x 20.32 cm
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National Museum of American History
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