## N

A coin spun on its edge can be made to fall the same side up every time if the edge is bevelled making the circumference of one side smaller. A coin so prepared will always fall with the larger sized circumference face up. Fig (4) shows edge view of such a coin.

A little known extension of the above principle in which a coin when spun on its edge can be made to fall either heads or tails at will is to bevel half the circumference on one side and the other half on the other side (5). Which side of the coin falls face up is determined by spinning the coin on the proper half of the edge to bring about the required result.

A small coin is spun on the table and a matchbox held as in (6) is smashed down onto the spinning coin which vanishes. If a wooden matchbox is used and the drawer is mouth down the action of bringing the box down sharply onto

the revolving coin will cause it to penetrate the cover of the matchbox and end up inside, having apparently vanished. Wooden boxed being no longer freely available the following ideas may be worthy of experiment. Obtain a matchbox with a drawer which is fairly loose fitting. With the box again held as in (6) tilt the outer end of the box up allowing the drawer to slide about halfway out of the cover and in smashing the box down aim the open part of the drawer at the coin, and as the box makes contact with the table push the drawer into the cover with the heel of the hand, or laternatively, with the fingers pull the cover back over the drawer. A second idea is to have duplicate coin already in the box and kick the spinning coin into the lap with the box as it hits the table. Either of these methods could puzzle those who are conversant with the old method, especially if a small slit is made in the cover of the box used.

Pick up a coin between two pins as in (7) and blow on the face of either the upper or lower half of the face of the coin — it will revolve at a surprising speed. A coin with a milled edge is best, and if the coin is placed on a match box or something similar it will be easier than picking it up directly from the table.

Place a glass on the table about a foot away from the edge and rest a coin on its edge behind the glass and challenge anyone to knock the coin over with another coin. The secret is simple, and is achieved by spinning the coin on its edge, which in addition to spinning on its axis also moves in a circle. With a little judgement the spinning coin can be made to knock the coin over. (8).