Solar Cell and Motor

Good quality one piece spinning, rolled rim, polished finish vessel with wooden/bakelite lid fitted with rubber stopper and metal stirrer..
A. Copper 75 x 50 mm
B. Copper 100 x 75 mm
C. Aluminium 75 x 50 mm
D. Aluminium 100 x 75 mm

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.