Modern Magic: A Practical Treatise on the Art of Conjuring

TO DETECT, WITHOUT CONFEDERACY, WHICH OF FOUR CARDS HAS BEEN TURNED ROUND IN YOUR ABSENCE.--It will be found upon examining a pack of cards, that the white margin round the court cards almost invariably differs in width at the opposite ends. The difference is frequently very trifling, but is still sufficiently noticeable when pointed out, and may be made available for a trick which, though absurdly simple, has puzzled many. You place four court cards of the same rank, say four queens, in a row, face upwards, taking care that the wider margins of the cards are all one way. You then leave the room, and invite the company to turn round lengthways during your absence any one or more of the four cards. On your return you can readily distinguish which card has been so turned, as the wider margin of such card will now be where the narrower margin was originally, and vice versâ. There is so little chance of the trick being discovered, that you may, contrary to the general rule, repeat it if desired. Should you do so, it is better not to replace the cards already turned, as this might give a clue to the secret, but carefully note in your own mind their present position, by remembering which you can discover any card turned just as easily as at first. TO ARRANGE TWELVE CARDS IN ROWS, IN SUCH A MANNER THAT THEY WILL COUNT FOUR IN EVERY DIRECTION.--This is rather a puzzle than a conjuring trick, but may sometimes serve as an interlude to occupy the minds of your audience while you are preparing for some other feat. The secret is to place nine of the twelve cards in three rows, so as to form a square; then place the remaining three cards as follows: the first on the first card of the first row, the second on the second card of the second row, and the last on the third card of the last row.