hg set out to experiment at once. this is done the weight of the lower hemisphere will be sufficient to separate it fromthe upper one. Guericke at- This machine being very exact and powerful, a prolonged purpose he used a pump, provided with the necessary stop- | tached one hemisphere to a hook… … um in the cylinder. The piston duced Otto von Gucricke to leave was consequently forcibly drawn Magdeburg and bring his appa- into the cylinder, while the men ratus to his palace at Wiirzburg. attached to the ropes were sud- At the latter place the celebrated denly jerked forward in spite…
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