Bar And Gauge Physics
With a cutout mounted on a separate wooden handle, which just admits the bar lengthways and a hole into which the bar passes endways when cold. For illustrating Linear and Spherical Expansion by heating, and contraction by cooling. Mild Steel bar 110 mm x 12.5 mm, Length x Diameter, mounted on a rod with wooden handle and a Brass gauge 150 mm x 38 mm.