Abstract: There is described a method for manufacturing by electroplating substantially flat dies or similar, which comprises adjusting the electric current strength by varying the sparing between the cathode and the anode inside the electrolyte proper.
Abstract: There is described a method for manufacturing by electroplating substantially flat dies or similar, which comprises adjusting the electric current strength by varying the sparing between the cathode and the anode inside the electrolyte proper.
Abstract: There is described a method for making a metal master for producing a gramophone record provided with writing in the center thereof, particularly inside a pressure press, and according to which the engraving of the sound-grooves is obtained from a mold element which is prepared by galvanically plating metal on a non-conductive support which has been engraved previously, in which means are provided to prepare an etching on the center part of the non-conductive support, on which support is then performed the galvanic metal plating to form the one mold element for producing one record side.