Fig. 35.—Garter Trick in half and coiled round and round on the table until it is almost impossible to tell for certain which is the loop proper, i.e., the point at which the tape was doubled. (See Fig. 35.) The bystander is then requested to place the point of his penknife in the loop, but however careful he may be in his selection he will fail, as the performer is able to pull the tape clear of the knife in all cases. The secret lies in the fact that the tape is not folded exactly in half, one end being left shorter than the other by about three inches. When uncoiling the tape, if the knife be actually placed in the loop, and both ends are pulled from the point A, it will not come away; but if the short end be passed round to the left and both ends pulled from the point B, it will be found to come clear of the knife. All the performer has to do, therefore, is to watch and see if the knife is really placed in the loop or otherwise, and to act accordingly. The short end is carried round under cover of the fingers while twisting the tape.
Fig. 35 is arranged for clearness, but in actual practice the tape would receive many more twists, which would also be of a more intricate nature.
CHAPTER IX
MISCELLANEOUS TRICKS
Flash Paper.—Having had occasion several times during the course of the present work to make use of "flash paper," I will now describe the manner in which it is prepared. It is not, however, practical to manufacture it at home, as it can be obtained in large quantities at a very small cost.
A mixture of nitric and sulphuric acids, one part of the former to two of the latter, is made, and allowed to stand for twelve hours before using. The experiment should be made in the open air. Ordinary tissue paper is then immersed in the fluid for a few seconds, after which it is taken out and washed well in clear water, until all trace of the acid has been removed. This can be ascertained by the use of blue litmus paper, which when dipped into the water will betray the presence of the acid by turning red. The paper should then be dried in a warm atmosphere, but not near a fire, and it is ready for use.
Flash handkerchiefs are prepared in a similar manner. For this purpose take a piece of fine cambric, wash it well in hot water to remove all grease and other impurities, and then treat it in the same way as the paper.
A New Fire Flash.—This forms a very good opening trick. The performer steps on the stage and, in what appears to be a careless manner, picks up a piece of paper from the floor, rolls it up in his hands, and throws it in the air, where it disappears in a flame, leaving no trace behind.
To produce this effect you must obtain some very fine glass tubing about the thickness of a darning needle, and having broken off several pieces about an inch long, fill them with sulphuric acid. This can be done with the aid of a long piece of india-rubber tubing, the acid being drawn into the glass by suction. The ends of the tube are then sealed hermetically in the flame of a spirit lamp. You must next prepare a powder composed of equal parts of chlorate of potass and powdered lump sugar. Wrap a very small quantity of this powder—about as much as will lie on a penny—together with one of the acid tubes in a piece of flash paper, and all is ready.