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An aneroid barometer
The corrugated rubber tube from a gas mask, or a cycle grip, can be used to make a model aneroid barometer. No huge accuracy is to be expected due to the many possible errors.
Two good corks or pieces of non-porous wood are required to close the ends of the tube, which serves as a vacuum box. They are fitted when the rubber is compressed and they should be made airtight with wax and by tying string round the exterior of the rubber.
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