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Rh duplicate of the other in appearance, but considerably lighter in weight. Aluminium and zinc are alike in appearance and afford the necessary disparity, in weight.

The zinc disc is given for examination, and a member of the audience is requested to float it on the water; he, of course, fails. On receiving back the zinc disc the performer "rings" it for that in aluminium and proceeds to surprise the company. I have arranged a special sleight of hand change for the trick as follows:—You carry a handkerchief in the left breast pocket and the aluminium disc palmed in the left hand. On receiving back the zinc disc in the right hand, you forthwith seem to place it in the left hand, really palming it and showing its prototype. The right hand now takes the handkerchief from the pocket and proceeds to dry what seems to be the wet zinc disc. This latter action gives an excuse for the transfer of the disc from one hand to the other, while the handkerchief effectually conceals the "palm."

The disc is now floated. The handkerchief and the zinc disc are now transferred in a careless manner to the left hand, which forthwith returns the handkerchief (handkerchief only) to the pocket.