electrophorous
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Definition of 'electrophorous' The Standard Electrical Dictionary
1. electrophorous
apparatus for the production of electric charges of high potential by electrostatic induction, q. v. It consists of a disc of insulating material B, such as resin or gutta percha, which is held in a shallow metal-lined box or form . The disc may be half an inch thick and a foot or more in diameter, or may be much smaller and thinner . A metal disc A, smaller in diameter is provided with an insulating handle which may be of glass, or simply silk suspension strings . To use it the disc B is excited by friction with a cat-skin or other suitable substance . The metallic disc is then placed on the cake of resin exactly in its centre, so that the latter disc or cake projects on all sides. Owing to roughness there is little real electric contact between the metal and dielectric . On touching the metal disc a quantity of negative electricity escapes to the earth . On raising it from the cake it comes off excited positively, and gives a spark and is discharged. It can be replaced, touched, removed and another spark can be taken from it, and so on as long as the cake stays charged.energy expended. This is derived from the muscular energy expended by the operator in separating the two discs when oppositely excited. As generally used it is therefore an apparatus for converting muscular or mechanical energy into electric energy .
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