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Harbottle

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#791  Harbottle Apparatus.  The Harbottle helps students understand the meaning of fluid pressure and pressure sreduction.  A Harbottle is a round, glass, container with a balloon stretched over its opening and a hole in the flattened base that is fitted with a rubber stopper.  Students are amazed when the balloon remains inflated inside the bottle even though it is not tied off or sealed.  Supplied with instructions.