RING AND BALL, GRAVESANDE PSAW |
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| RING AND BALL, GRAVESANDE PSAW
(1210 ) |
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An apparatus for demonstrating thermal expansion, comprising of a captive brass ball secured to a mounted brass ring by a chain. Ring mounted rod with wooden handle. The ball passes through the ring when cold but will not pass through when heated, ball dia 25mm.
Same as above but ball dia. 19 mm
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