Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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<
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>THEOREME II.</
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When in one of the above ſaid Veſſels, of what ever
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breadth, whether wide or narrow, there is placed ſuch
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a Priſme or Cylinder, inviron'd with Water, if we
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vate that Solid perpendicularly, the Water
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ſed ſhall abate, and the Abatement of the Water,
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ſhall have the ſame proportion to the Elevation of the
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Priſme, as one of the Baſes of the Priſme, hath to
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the Surface of the Water Circumfuſed.
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The proportion
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of the water
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ted, to the Solid
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raiſed.</
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>Imagine in the Veſſell, as is aforeſaid, the
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Priſme A C D B to be placed, and in the
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reſt of the Space the Water to be
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fuſed as far as the Levell E A: and
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ſing the Solid, let it be transferred to
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G M, and let the Water be abaſed from
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E A to N O: I ſay, that the deſcent of
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the Water, meaſured by the Line A O,
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hath the ſame proportion to the riſe of the
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Priſme, meaſured by the Line G A, as the Baſe of the Solid G H
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hath to the Surface of the Water N O. </
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<
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>The which is manifeſt:
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becauſe the Maſs of the Solid G A B H, raiſed above the firſt Levell
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E A B, is equall to the Maſs of Water that is abaſed E N O A.
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Therefore, E N O A and G A B H are two equall Priſmes; for of
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equall Priſmes, the Baſes anſwer contrarily to their heights:
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fore, as the Altitude A O is to the Altitude A G, ſo is the
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cies or Baſe G H to the Surface of the Water N O. </
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>If therefore,
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for example, a Pillar were erected in a waſte Pond full of Water,
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or elſe in a Well, capable of little more then the Maſs of the ſaid
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Pillar, in elevating the ſaid Pillar, and taking it out of the Water,
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according as it riſeth, the Water that invirons it will gradually abate,
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and the abaſement of the Water at the inſtant of lifting out the
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Pillar, ſhall have the ſame proportion, that the thickneſs of the Pillar
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hath to the exceſs of the breadth of the ſaid Pond or Well, above
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the thickneſs of the ſaid Pillar: ſo that if the breadth of the Well
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were an eighth part larger than the thickneſs of the Pillar, and the
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breadth of the Pond twenty five times as great as the ſaid thickneſs,
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in the Pillars aſcending one foot, the water in the Well ſhall deſcend
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ſeven foot, and that in the Pond only 1/25 of a foot.</
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Why a Solid
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leſs grave
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in
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cie
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than water,
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ſtayeth not
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der water, in
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ry ſmall depthst.</
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<
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>This Demonſtrated, it will not be difficult to ſhew the true
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cauſe, how it comes to paſs, that,</
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