Apparatus Bar & Gauge
For illustrating expansion by heat and contraction by cooling. Length 225mm approx. Comprising a bar of iron 108 mm x 12.7 mm l x d, mounted on a support rod fitted with a wooden handle and a brass gauge 150 x 38 mm with a cut-out -which just admits the bar lengthways and a hole and a hole which passes the bar endways when cold.
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