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Ball And Ring.

This popular demo of metal expansion and contraction consists of a brass ball and ring mounted on steel rods with wooden handles. At room temperature the ball passes through the ring; when heated it will not. Includes instructions.

612-0010

$14.25

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This popular demo of metal expansion and contraction consists of a brass ball and ring mounted on steel rods with wooden handles. At room temperature the ball passes through the ring; when heated it will not. Includes instructions.

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