diameter slightly less than that of the chamber 10 and is so disposed therein that its inner surface is radially offset outwardly of the perimeter of the aperture 16 in bottom wall 17 the cylinder is preferably split lengthwise to permit easy removal of the silver deposited thereon simply by expanding same after removal from the apparatus to a flat configuration and flexing it opposed pairs of openings 32 only one pair being shown similar to the openings 19 in the chamber 10 are formed in the cylinder 30 and at about the same distance from the bottom wall 17 however these openings 32 are oriented 90 u00b0 about the vertical axis of the chamber with respect to the openings 19 so that respective pairs of openings in the two members do not register an auxiliary winding 34 is conveniently wound around the field coil of the motor 22 the induced current in the coil is rectified by a full wave rectifier 35 and one side of the rectified d c current is delivered to the cylinder 30 through one of the bolted brackets 31 while the other side is delivered to the rod 29 through the nut 25 to provide a circuit for electrolysis of silver bearing solution in the chamber the polarity of this circuit is such that the rod 29 is the anode and the cylinder 30 is the cathode upon which silver is plated fig2 and 4 illustrate a cover 36 formed with a peripheral flange 37 for a purpose later to be described a conventional time 39 fig2 is mounted within the cover and by means of which the energization of the unit.