Rolt-Wheeler, Francis, 1876-1960, ed · New York : Current Literature Pub. Co. · leaf 49
vercome would equal,roughly, 9,780 pounds. According to von Guerickes cal-culations, a force of 2,686 pounds would overcome the at-mospheric pressure upon the exterior of the spheres. Heremust be some error! There is extant a quaint old engraving showing thehorses endeavoring to separate the… … Fig- 7 -Von Guerickes Air PUMp. THE PROPERTIES OF MATTER 37 periments Touching the Spring of the Air and stated thelaw which has since borne his name: Under like conditions of temperature and pressure thevolume of a gas varies inversely as the pressure upon it. We took then a long glass tube, he…
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