ELECTROPLATING, the art of depositing metals by the electric current.
These require constant shifting because the objects are in contact at many points, and because the top ones shield those below from the depositing action of the current.
Elmore, Dumoulin, Cowper-Coles and others have prepared copper cylinders and plates by depositing copper on rotating mandrels with special arrangements.
Elec. Eng., 1898, 2 7, p. 99) very successfully produced true parabolic reflectors for projectors, by depositing copper upon carefully ground and polished glass surfaces rendered conductive by a film of deposited silver.