Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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alſo inſtead of the Chord that rolleth about the Cylinder C, place
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there a ſmall Wheel with teeth or Coggs, that may turn another
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greater, and by that means multiply the power of the Force as
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much as one ſhall pleaſe, without having any thing to deduct of
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the ſame, ſave only the difficulty of moving the Machine, as in the
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others.</
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The
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SCREW,
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Cochlea.
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>When once the Force of the Capſten and of the In
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clined Plane is underſtood, that of the Screw is eaſie
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to be computed, for it is compoſed only of a Plane
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much inclined, which windeth about a Cylinder: and if this Plane
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be in ſuch manner Inclined, as that the Cylinder ought to make
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v. </
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>gr.
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ten turns to advance forwards the length of a foot in the
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Screw, and that the bigneſs of the Circumference of the Circle
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which the Force that turneth it
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about doth deſcribe be of ten
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feet; foraſmuch as ten times ten
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are one hundred, one Man alone
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ſhall be able to preſs as ſtrongly
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with this Inſtrument, or Screw, as
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one hundred without it, provided
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alwaies, that we rebate the Force
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that is required to the turning
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of it.</
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>Now I ſpeak here of Preſſing rather than of Raiſing, or Remo
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ving, in regard that it is about this moſt commonly that the Screw
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is employed, but when we would make uſe of it for the raiſing of
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Weights, inſtead of making it to advance into a Female Screw, we
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joyn or apply unto it a Wheel of many Coggs, in ſuch ſort
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made, that if
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v. </
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<
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>gr.
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this
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W
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heel have thirty Coggs, whilſt the Screw
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maketh one entire turn, it ſhall not cauſe the
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W
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heel to make more
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than the thirtieth part of a turn, and if the
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W
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eight be faſtned to
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a Chord that rowling about the Axis of this
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W
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heel ſhall raiſe it but
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one foot in the time that the
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W
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heel makes one entire revolution,
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and that the greatneſs of the Circumference of the Circle that is
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deſcribed by the Force that turneth the Screw about be alſo of ten
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ſeet, by reaſon that 10 times 30 make 300, one ſingle Man ſhall be
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able to raiſe a
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W
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eight of that bigneſs with this Inſtrument, which
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is called the Perpetual Screw, as would require 300 men with
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out it.</
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>Provided, as before, that we thence deduct the difficulty that
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we meet with in turning of it, which is not properly cauſed by the
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Ponderoſity of the
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W
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eight, but by the Force or Matter of the In</
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