PHY-HEAT-43 Expansion Apparatus

Comprising two cast-metal uprights linked by a pair of parallel plated metal support rods and supporting an expansion bar at the top. The expansion bar is fixed to one upright and rests beneath a friction pointer on the other upright. The pointer moves along a scale reading 0 to 90°. Expansion of the bar on heating causes the pointer to move along the scale. Supplied complete with expansion bars, one each of aluminium, brass and iron