...ates patent was granted for this process in 1868. See also Garnier's process, Photographic journal, Vol. VI., p. 31 et seq. An important improvement in electro-plating is that of M. Oudry of Auteuil , near Paris, for coating large objects made of iron with a thick layer of copper. In the old process it was customary to clean the pieces to be plated, and after subjecting them to a weak prelimina...