Bar and Gauge

For illustrating expansion by heating and contraction by cooling.

Comprising a bar of iron, (L)108mm x (D)12.7mm, mounted on a support rod fitted with a wooden handle, and a brass gauge (150mm x 38mm) with a cut-out, which just admits the bar lengthways, and a hole which passes the bar endways when cold.

• Length: 225mm approx.