For showing the difference in conductivity.
Rod 300 x 18 mm half brass & half polished wood.
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Represents a typical air cooled, side-valve four-stroke petrol engine with the operation of the valves clearly evident, cams being driven by a gear train from rear of the main crank. As with the two-stroke model, simulated spark plug uses a small lamp to indicate the firing point. Screw terminals are provided for connection to 3 Volts battery. Cross-section of carburetter is shown. Mounted on base
One piece spinning with parallel sides & rolled rim.. Size: 75 x 50 mm 100 x 75 mm
GRAVESANDE – Ring and Ball with Chain. An apparatus for demonstrating thermal expansion, comprising a captive brass ball secured to a mounted brass ring by a chin, Ring mounted on rod with a wooden handle. The ball passes through the ring when cold but will not pass through after being heated
One cylinder, 4 cycled and double valve system gas engine, to show operations like intake, compression, explosion, exhaust, spark and others, mounted on wooden base with spark plug and battery.
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