needle between the rodand the glass plate in such a way that if the rod moves it willcause the needle to roll on the plate. Pass the point of the needle through a straw or a strip ofthin aluminium foil to serve as a pointer. A small motion ofthe needle causes the end of the pointer to move over a… … Fig. 22. on the plate and moves the pointer. On removing the gas-burner the rod cools and the pointer comes back to its originalposition. EXPERIMENT (9). To skew that different bodies expanddifferently when raised to tlie same temperature. Let a gauge such as that described in Experiment 7 abovebe…
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