small ball runs freely through the tube, but the large one will not pass the centre on account of the indentation.
On receiving back the tube the performer secretly drops the large ball into it, which, owing to the force of the fall, is pinched in the centre and will not fall out. In this condition the tube can be turned about in all directions and will still appear empty. When placing it on the table the performer is careful to bring it down rather smartly on the end at which the ball was introduced, when, owing to the concussion, the ball is released and falls on the table.
The tube can be used to cause the disappearance of a ball in the following manner:—Place the ball on a tea plate and cover it with the tube, which in turn cover with a second plate. By reversing the position of the structure the ball falls into the tube, where it is retained in the manner described, and after a little more twisting and turning, to add to the general confusion, the plates are removed and the ball is proved to have disappeared.
The ball can of course be reproduced if desired; or if two tubes are used it may be, apparently, passed from one to the other. In this case, however, it is suggested that round discs
