Physiologia Epicuro-Gassendo-Charltoniana: or a fabrick of science natural, upon the hypothesis of atoms / Founded by Epicvrvs, repaired [by] Petrvs Gassendvs, augmented [by] Walter Charleton ... The first part.

Walter Charleton

Date:: 1654

Credit: Physiologia Epicuro-Gassendo-Charltoniana: or a fabrick of science natural, upon the hypothesis of atoms / Founded by Epicvrvs, repaired [by] Petrvs Gassendvs, augmented [by] Walter Charleton ... The first part. Source: Wellcome Collection.

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$of 27 digits, to be near upon two pound, Paris weight: and upon confe- quencc the weight of Water in the fame Tube, of 32^feet in altitude, to be the fame-, and the weight of the Cylindre of Aer, from its bafe incum¬ bent on the furface of the reftagnanc Quickfilver, up to it's top at the fum- mity of the Atmorphere, to be alfo the fame ^ otherwife there could be no ^equilibrium. Here, as a Corollary^ we may add , that infomuch as the force of a body Attrahent may be a^quiparated to the weight of another body fpontaneoufly defeending or attracted magnetically by the Earth : thereupon we may conclude, that the like proportion of weight appended to the handle of the wooden Sucker, may fuffiCc to the incroduaion of an equal Vacuum, in (74//7i<? jBrars Cylindre, - • ^ ■ . 'rt , But, perhaps, yoti’l obje^-,, that this feems rather'to entangle then dif- lbl\^ the Riddle. Since by how much the larger the cavity of the Tube by fo much the greater the quantity, and fo the weight of the Quickfilvet Contained .* and by how much the greater the weight, or force or the De- primertt, by fo much the more muft the Deprefled yeild, and conlequentlyi fomuch the lowermufl: the Equilibrium be ftatcE To extricate you from this Labyrinth, we retort 5 that the caufe of the E^quilibriums conftancy to the point of 27 digits, whatever be the Mercury contained in the Tube, is the fame with that which makes the defeent of twq bodies of the fame matter, but different weights, to be t/£qaallj Srvifh for a bullet of Lead of an ounce, falfs denyn as fwiftly as one of loO pound. For, in refpea:, that a'Cylindre of Qpickmyer contained in a Tube of a la^e dia metre, doth riot deftend more fwiftly, then a Cylindre of Quickfilver contained^Tubepf i harrow di^ctre / therefore is it, that the one doth not pfefs the bottom* upon which as its Bafe, it doth impend, more violently thpn thC other doth prefs upon its Bafe •, and confequently, the reftagriaht QuickfilVet about the larger Cylindre doth not, in its elevation or* rifit^ upward* more comprefs the Bafis of the impendent Cylindre of Acr: thed wBatd^ reftagnint about the lefler Cylindre. Whereupon ^etijay conclude^* that a great Cylindre of Aer refifting a great Cylindre of Quickfilver^%6 Icfs then a fmall doth refift a fm^ll *♦ therefore ought the iEdyilibriurd^b^ ^ixt the dcpreirure of the Quickfilver, and the refiftenCeof* the eirdurri^ ftant Aer, to be conftant to the altitude of ay digits, afwell itt-a largcj' ds a narrow Tube. Which reafon may alfo be accommodatcel fcO Liquors, ■ i j j u. >1 ■^rf. II. Why the quiltbrium is conftanc ru the fame point of altitude in a Tube of a large concave, as well as in one of a fmall; when theforce of the Depri- ment muft be greater in the one, then the other. 12. The folurfon thereof by the appropriaiio'.! of the fame Caufe, which makes the de¬ feent of two bo- diet, of different weights, dqui- velox. I 1 ib' '' I ' t > vO I; . « I ... ■ 'd'll r! ._ fi; vj’-n-'- ! ■ j/'i r] ■ -Vj . t J , ^ a-r:i • . S£_,Ct? . -'..i, j.lc i, -Ij vvt-'i ■’Hi: !T$