File:Electrostatic friction machines.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	01:34, 2 April 2011		711 × 347 (31 KB)	Spinningspark	{{Information \|Description=A cylinder friction electric machine and a disk electric friction machine. \|Source=''Lectures on Electricity and Galvanism, in their physiological and therapeutical relations'', delivered at the Royal College of Physicians, in M

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