How to Do Chemical Tricks — Effect of Compression

Fuse together in a crucible, eight parts of bismuth, five of lead and three of tin; these metals will combine and form an alloy, of which spoons may be made, possessed of the remarkable property of melting in boiled water.

Effect of Compression.

Take a wooden reel and hollow out either the top or bottom, beginning at the hole in the center and working towards the edge.

In the hollow place a ball.

Apply to the other end the indiarubber tube which conducts the forced air, and the ball will be lifted up (see fig. ).