Modern Magic: A Practical Treatise on the Art of Conjuring

CHAPTER VII. TRICKS WITH COIN WITHOUT APPARATUS. There is an immense variety of tricks with coin--some with apparatus, some without; some demanding a thorough mastery of sleight-of-hand; some so simple as to be within the compass of the merest tyro. The only classification which we shall attempt will be to divide them into such as do and such as do not require special apparatus. A FLORIN BEING SPUN UPON THE TABLE, TO TELL BLINDFOLD WHETHER IT FALLS HEAD OR TAIL UPWARDS.--You borrow a florin, and spin it, or invite some other person to spin it, on the table (which must be without a cloth). You allow it to spin itself out, and immediately announce, without seeing it, whether it has fallen head or tail upwards. This may be repeated any number of times with the same result, though you may be blindfolded, and placed at the further end of the apartment. The secret lies in the use of a florin of your own, on one face of which (say on the “tail” side) you have cut at the extreme edge a little notch, thereby causing a minute point or tooth of metal to project from that side of the coin. If a coin so prepared be spun on the table, and should chance to go down with the notched side upwards, it will run down like an ordinary coin, with a long continuous “whirr,” the sound growing fainter and fainter till it finally ceases; but if it should run down with the notched side downwards, the friction of the point against the table will reduce this final whirr to half its ordinary length, and the coin will finally go down with a sort of “flop.” The difference of sound is not sufficiently marked to attract the notice of the spectators, but is perfectly distinguishable by an attentive ear. If, therefore, you have notched the coin on the “tail” side, and it runs down slowly, you will cry “tail;” if quickly, “head.”