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Magic Fountain

Take a tall glass tube, hermetically sealed both at top and bottom, by

means of a brass cap screwed on to a stop-cock, and place it on the

plate of the pump. When the air is exhausted, turn the cock, take the

tube off the plate, and plunge it into a basin of mercury or water.

Then the cock being again turned, the fluid, by the pressure of the

air, will play upon the tube in the form of a beautiful fountain.