Galilei, Galileo
,
Mechanics
,
1665
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[Figure 11]
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[Figure 12]
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[Figure 13]
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[Figure 14]
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[Figure 27]
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[Figure 28]
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[Figure 29]
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>From the Inſtrument laſt deſcribed, the other Inſtrument which
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we call the Crane is not much different, as to form, nay, differeth
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nothing, ſave in the way of applying or employing it: For that the
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Capſten moveth and is conſtituted perpendicular to the Horizon,
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and the Crane worketh with its Moment parallel to the ſame Ho
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rizon. </
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>For if upon the Circle D A E we ſuppoſe an Axis to be
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placed Column-wiſe, turning about the Center B, and about which
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the Rope D H, faſtened to the Weight that is to be drawn, is be
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laid, and if the Bar F E B D be let into the ſaid Axis [
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by the Mor
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tace B
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] and the Force of a Man, of an Horſe, or of ſome other
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Animal apt to draw, be applyed at its end F, which moving round,
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paſſeth along the Circumference F G C, the Crane ſhall be framed
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and finiſhed, ſo that by carrying round the Bar F B D, the Barrell
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or Axis E A D ſhall turn about, and the Rope which is twined a
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bout it, ſhall conſtrain the Weight H to go forward: And becauſe
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the point of the Fulciment about which the Motion is made, is the
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point B, and the Moment keeps at a Diſtance from it according to
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the Line B F, and the Reſiſtor at the Diſtance B D, the Leaver
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F B D is formed, by vertue of which the Force acquireth Moment
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equall to the Reſiſtance, if ſo be, that it be in proportion to it, as
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the Line B D is to B F, that is, as the Semidiameter of the Axis to
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the Semidiameter of the Circle, along whoſe Circumference the
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Force moveth. </
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>And both in this, and in the other Inſtrument we
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are to obſerve that which hath been frequently mentioned, that is,
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That the benefit which is derived from theſe Machines, is not that
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which the generality of the Vulgar promiſe themſelves from the
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Mechanicks; namely, that being too hard for Nature, its poſſible </
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