Hand Wheel Driving Unit

For illustrating expansion by heating and contraction by cooling.

Comprising a mild steel bar 110 x 10 mm. length x diameter, on rod with wood handle, overall length approx. 280 mm. with metal cast gauge, sliding fit over ends of bar and with hole 10 mm. bore in one Arm.

One piece spinning with parallel sides & rolled rim..
Size:
75 x 50 mm
100 x 75 mm