The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 104
cups were invented and first used by Otto Guerick, the inventor oftlie air-pump, and named from the city where first used. An experiment wasperformed by the discoverer before the royal household with a pair of thesecups, which were three feet in diameter. When exhausted of air, twenty stronghorses… … Why is a thin square bottle crushed in when the air is removed from its in-terior ? MAGDEBURGH HEMISPHERES. 99 Fig. 78. and then form a vacuum. With the stop-cock closed, remove and replace the handle.These hemispheres, of five inches diam-eter, will now be pressed together bythe force t)f the…
Physics
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