Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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Lines, which fall at Right Angles on thoſe whereon the Weights
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hang, and would move, if ſo be they were permitted to deſcend
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freely.</
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>Of the BALLANCE and LEAVER.</
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>Having underſtood by certain Demonſtration, one of the
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firſt Principles, from which, as from a plentiſul Fountain,
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many of the Mechanical Inſtruments are derived, we may
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take occaſion without any difficulty to come to the knowledge of
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the nature of them: and firſt ſpeaking of the Stiliard, an Inſtru
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ment of moſt ordinary uſe, with which divers Merchandizes are
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weighed, ſuſtaining them, though very heavy, with a very ſmall
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counterpoiſe, which is com
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monly called the Roman or
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Plummet, we ſhall prove that
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there is no more to be done in
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ſuch an operation, but to re
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duce into act and practice
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what hath been above contemplated. </
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>For if we propoſe the Bal
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lance A B, whoſe Fulciment or Lanquet is in the point C, by
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which, at the ſmall Diſtance C A, hangeth the heavy Weight D,
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and if along the other greater C B, (which we call the Needle of
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the Stiliard) we ſhould ſuppoſe the Roman F, though of but little
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weight in compariſon of the Grave Body D to be ſlipped to and
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fro, it ſhall be pofſible to place it ſo remotely from the Lanquet C,
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that the ſame proportion may be found between the two Weights
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D and F, as is between the Diſtances F C, and C A: and then ſhall
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an
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Equilibrium
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ſucceed; unequall Weights hanging at Diſtances
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alternately proportional to them.</
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>Nor is this Inſtrument different from that other called
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Vectis,
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and vulgarly the ^{*} Leaver, wherewith great Weights are moved
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by ſmall Force; the application of which is according to the Fi
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gure prefixed; wherein the Leaver
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is repreſented by the Bar of wood
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or other ſolid matter,
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B
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C D, let
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the heavy Weight to be raiſed be
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A, and let the ſteadfaſt ſupport
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or Fulciment on which the Leaver
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reſts and moves be ſuppoſed to be
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E, and putting one end of the
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Leaver under the Weight A, as
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may be ſeen in the point C, en
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creaſing the Weight or Force at the other end D, it will be able
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to lift up the Weight A, though not much, whenever the Force in </
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