Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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which likewiſe have for their Center that of the Earth, for that it
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is not any way ſenſible.</
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The
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WEDGE,
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Cuneus.
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>The Force of the Wedge A B C D is eaſily underſtood after
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that which hath been ſpoken above of the Inclined Plane,
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for the Force wherewith we ſtrike downwards acts as if it
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were to make it move according to the Line B D; and the Wood,
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or other thing and Body that it cleaveth, openeth not, or the
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Weight that it raiſeth doth not riſe, ſave only according to the
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Line A C, inſomuch that the Force,
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wherewith one driveth or ſtriketh this
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Wedge, ought to have the ſame Pro
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portion to the Reſiſtance of this
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Wood or Weight, that A C hath to
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A B. </
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>Or elſe again, to be exact, it
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would be convenient that B D were
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a part of a Circle, and A D and
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C D two portions of Spirals that had the ſame Center with the
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Earth, and that the Wedge were of a Matter ſo perfectly hard
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and polite, and of ſo ſmall weight, as that any little Force would
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ſuffice to move it.</
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The
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CRANE,
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or the
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CAPSTEN,
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Axis in Peritrochio.
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>We ſee alſo very eaſily, that the Force wherewith the Wheel
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A or Cogg B is turned, which make the Axis or Cylinder C
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to move, about which a Chord is rolled, to which the
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Weight D, which we would raiſe, is faſtned, ought to have the
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ſame proportion to the ſaid
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Weight, as the Circumference of
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the Cylinder hath to the Cir
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cumference of a Circle which
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that Force deſcribeth, or that the
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Diameter of the one hath unto
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the Diameter of the other; for
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that the Circumferences have the
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ſame proportion as the Diame
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ters: inſomuch that the Cylinder C, having no more but one foot
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in Diameter, if the Wheel AB be ſix feet in its Diameter, and the
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Weight D do weigh 600 pounds, it ſhall ſuffice that the Force in
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B ſhall be capable to raiſe 100 pounds, and ſo of others. </
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