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Rh bottle. You first borrow a half dollar from a spectator, and secretly exchange it for your "folding-coin." Exhibit the bottle, which should be of clear glass, preferably, and demonstrate the impossibility of passing a coin into its neck.

Then grasp the mouth of the bottle in the manner depicted in Fig. 12, the coin being concealed from the spectators by your fingers. Bend the coin and insert it in the neck of the bottle, after which give the mouth of the bottle a violent blow with the palm of the hand. The coin will enter the bottle, and expand as soon as it passes the neck. You may now pass the bottle for