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A28956 A defence of the doctrine touching the spring and weight of the air propos'd by Mr. R. Boyle in his new physico-mechanical experiments, against the objections of Franciscus Linus ; wherewith the objector's funicular hypothesis is also examin'd, by the author of those experiments. Boyle, Robert, 1627-1691.; Sharrock, Robert, 1630-1684. 1662 (1662) Wing B3941; ESTC R26549 92,713 134

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instance twice as big as it self it is of necessity that every part of it must likewise take up a place twice as big as it self p. 42. Juxta c. According to the more probable Opinion such a virtual extension of a corporeal Being is not to be granted as being onely proper to such as are Spiritual p. 43. Praestat c. It is better to continue in the common Opinion which hath been hitherto received in the Schools which although it doth not clearly resolve all difficulties yet it doth not openly lye under them Ibid. Necessario c. We must needs confess that one and the same part must be in two places adequately For seeing it is indivisible and takes up a greater place then before it must of necessity be all in every point of that place or that be virtually extended through all that space p. 45. Cum tempus c. Seeing Time is a Being essentially successive so that neither by divine power can two of its parts exist together p. 46. Respondeo c. I answer that all these things happen because the Gun-powder so kindled and turned into flame takes up a much greater space then before Whence it comes to pass that seeing the Chamber was before quite full by this means the walls are broken that there may be no penetration of bodies p. 50. Partim c. Sometimes within the Chappel sometimes in the open Air the wind sometimes blowing and sometimes being still p. 54. Sed d'ci c. But it may be said that on the top of the Mountain it therefore descended after that manner because the Air was more cold there or of some other temperature such as might cause this descent p. 71. Hoc esse c. That this is the difference between Pression and Suction that Suction makes such an adhesion and Pression doth not Ibid. Hoc quoque c. And even this Experiment doth very well agree with our Principles For seeing by this depression of the Sucker the Air shut up in the cavity of the Cylinder is separated from the Cylinder and doth descend together with the Sucker as we have Chap. 13. observed of water descending together with Quicksilver it comes to pass that in that whole depression new surfaces are taken from that descending Air and stretched out as we have there explained it in the case of descending water Since therefore such Sufaces are as easily slipt off and extended in the end of the depression as in the beginning it is no wonder that there is found the same difficulty of depressing it at both times p. 72. Eo magis c. That the Air is so much the more extended and rarefied by how much the more is thence exhausted and so doth acquire a greater force of contracting it self p. 74. At profecto c. But truly it seems not credible that this most soft Air should so vehemently compress a Glass on all sides especially one of that thickness there mention'd as to break it Ibid. Verius c. It is therefore more truly answered that the Glass is therefore so broken because by that exsuction its sides are more vehemently drawn inwards then by reason of the figure unfit for resistency they were able to resist For seeing the included Air doth most firmly stick to the sides of the Glass to draw out the Air will be nothing else but to endeavour to bend the sides of the Glass inwards p. 75. Sed profecto c. But truly this seems too far remov'd from Truth and may be by this alone sufficiently refuted Because if the pressure of the Air which descends by that Tube into the Vial be so great as to break the Vial it self it ought certainly before the breaking of the Vial very much to move the water in which the Tube is immers'd and to excite bubbles in it c. as appears if any one blowing through that Tube doth make but an ordinary pressure upon the water But it is sure that the water before the Vial is broken doth not move at all as the Experimenter will find Ibid. Licet c. Though the Tube had been shut at the top the Vial had doubtless been broken after the same manner p. 77. Sed rectius c. But it is more rightly thence inferr'd that that Cylinder did nothing there before Ibid. Dico c. I say then that the Quicksilver doth by that exhaustion so descend in the Tube because it is drawn downwards by the Air incumbent upon the restagnant Quicksilver For that incumbent Air being by its exhaustion greatly rarefied and extended vehemently contracts it self and by this contraction doth endeavour to lift the restagnant Mercury out of its Vessel whence it comes to pass that the restagnant Mercury now less gravitating upon the bottom of its Vessel the Quicksilver in the Tube must descend as is manifest in it self So that it is no wonder that the external Air afterwards entring the Quicksilver again ascends seeing by that ingress the force which elevates the restagnant Quicksilver is weakned p. 78. Atque hinc c. And hence is a reason also given of another thing which is there noted namely that by the violent intrusion of the external Air into the Receiver the Quicksilver ascended considerably above 29. Inches and an half For as by the extraction of the Air the Quicksilver is deprest below its station so by the intrusion of new Air it is elevated above it p. 80. Nam si c. For if it were kept up by that it ought rather to ascend then descend in colder weather because the Air then would be more dense and heavy Therefore the Quicksilver is not upheld by the Aequilibrium of Air as is asserted Ibid. Hinc fit c. Hence it comes to pass that this Funicle being contracted by the cold the water doth ascend in cold weather but doth descend in hot because by heat the Funicle is dilated p. 81. Ego certè c. I truly do not doubt but there are some such occult causes by which the slender Eunicle that suspends as we mentioned in the 10. Chapter the Quicksilver in the Tube is sometimes lengthned sometimes shortned and so doth sometimes let down and sometimes lift up the Quicksilver Ibid. In decimo nono c. In the 19. he shews that water doth in the same manner descend upon the exhausting the Receiver as he had shewn Quicksilver in the foregoing Chapter to descend Of both which seeing there is the same cause there is no reason we should any longer insist on this p. 82. Nam si c. For if it were done so these bubbles ought not so to have ascended from the bottom of the Vessel as it is asserted they did both in this and the following Experiments that treat of bubbles but from the upper part of the water where they are less comprest as it is apparently manifest p. 83. Respondeo c. I answer that the water upon that