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Title: Sumpner's portable standard volt- and wattmeter (an iron-cor [Go to resource]
Description: Sumpner's portable standard volt- and wattmeter (an iron-cored electrodynamometer), patent no.24605 of 1904, serial no.190W, calibration certificate dated 1911 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1987-430 Go to resource More Like this...-
Portable laboratory wattmeter, electrodynamometer…Portable laboratory wattmeter, electrodynamometer type…
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