The Lock Test

To do the lock test with any lock and five keys, have the envelopes in position in the stand. Hand each person a key and let them try it in the lock. As soon as they have tried a key in the lock, they are to drop the key into any envelope. You watch to see which key opens the lock and then note into which envelope it is dropped. Then when you turn away from the proceedings and the spectators take the envelopes, you know he has the key that opens the lock by t>e position of the ball corresponding to the envelope you noted.

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