File:The science-history of the universe (1909) (14770986081).jpg

Identifier: sciencehistoryofv3rolt (find matches)
Title: The science-history of the universe
Year: 1909 (1900s)
Authors: Rolt-Wheeler, Francis, 1876-1960, ed
Subjects: Science Geology Cosmology Physical sciences Life sciences Natural history Humanities
Publisher: New York : Current Literature Pub. Co.
Contributing Library: Lincoln Financial Foundation Collection
Digitizing Sponsor: The Institute of Museum and Library Services through an Indiana State Library LSTA Grant

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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 exhausted hemispheres.On the occasion of this experiment von Guericke assertedthat if you were to blow your breath into a large exhaustedreceiver, you would that moment breathe your last. Thetruth of this being doubted, he illustrated the power ofsuction by a new experiment. A cylinder of a largepump had a rope attached to its piston, which led over apulley and was divided into branches on which twenty orthirty men could pull. As soon as the cylinder was con-nected with an exhausted receiver the piston was suddenlypushed down by the atmospheric pressure and the menat the ropes were thrown forward. 36 PHYSICS debut taf^ Sed by thedisti^3hed mayor of Mag.ueourg was his own invention. The unner Lik t
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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 writes, which bya dexterous hand and the help of a lamp was in such amanner crooked at the bottom that the part turned up wasalmost parallel to the rest of the tube and, the orificeof this shorter leg being hermetically sealed, thelength of it was divided into inches (each of which wasdivided into eight parts) by a straight list of paper, whichcontaining those divisions, was carefully pasted all alongit. (A similar strip of paper was pasted on the longer leg.)Then as much quicksilver as served to fill the arch orbended part of the siphon was poured in so as to be at thesame height in both legs. This done, we began pouringquicksilver into the longer leg till the air in the shorterleg was by con

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