There are many different ways how a magician could make something appear. He could either achieve the effect by sleights of hands or by magic trickery. One of the most commonly used props for production magic is a device to pull the object into view in high speed with a thread of some kind of elastic.
Same principle can be applied on a prop with a lever. The object to be produced is first hidden and attached to the end of the lever. The lever is controlled by a spring and a switch to release the tension. Before the performance, the lever is pushed and the spring is compressed. They are held in this position with the object in the hiding place. When the magician touch the switch, the tension is released and the object is brought into the right place by the lever.
There is a classic magic trick called the Card in Balloon. A Balloon is placed at the top of a wooden stand. Behind the stand, there is a wooden arm attached to the card to be produced. The arm is controlled by a spring which is compressed in advance. When the trigger is pulled, the arm turns quickly, breaks the balloon and brings the card in the position of the balloon. It appears like the balloon breaks and the card is found inside the balloon.
The power to drive the lever to swing rapidly is not limited to spring tension. Other source of force like gravity, motor, elastic, counterweight or centrifugal force could be used. Here is an example. Let's study the coin trick by T. Nelson Downs. A magic wand is used in this trick. The wand should be prepared in a special way. One end of the wand is cut in the middle and split apart a little bit. The cut should be about one inch long. The split is separated a bit larger than the diameter of the wand.
The effect is to produce multiple coins with a very clean manner. Some special coins are used in this trick. Some a small ring is fused to the back of each coin perpendicularly. The rings are just large enough to pass through the wand but not the cut end. Therefore, a coin can be put onto the wand and concealed by the hand. When the magician swings the wand quickly, the coin is brought to the end of the wand quickly by centrifugal force. The split stop the coin from flying off.
Again, the same principle could be used in many different effects. With a little twist and adjustments, it could be applied to produce many different magic props. The source of force, the length of the lever, the path of flying and the concealment of action could all be adjusted to match the style of performance.
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