Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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Force in
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F,
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that it may raiſe the Weight, muſt move upwards, which
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to exanimate Movers, as being for the moſt part Grave Bodies, is al
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together impoſſible, or at leaſt more laborious,
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than the making of the ſame
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F
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orce down
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wards: Therefore to help this inconvenience,
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a Remedy hath been found by adjoyning an
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other Nut or Pulley above, as in the adjacent
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F
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igure is ſeen, where the Rope C E
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F
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hath
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been made to paſs about the upper Pulley
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F
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G
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upheld by the Hook L, ſo that the Rope paſſing
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to H, and thither transferring the
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F
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orce E, it
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ſhall be able to move the Weight X by pulling
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downwards, but not that it may be leſſer than
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it was in E:
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F
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or the Motions of the
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F
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orce
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F
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H, hanging at the equal Diſtances
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F
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D and
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D G of the upper Pulley, do alwaies continue
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equal; nor doth that upper Pulley (as hath
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been ſhewn above) come to produce any di
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minution in the Labour. </
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<
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>Moreover it having been neceſſary by
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the addition of the upper Pulley to introduce the Appendix B, by
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which it is ſuſtained, it will prove of ſome benefit to us to raiſe
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the other A, to which one end of the Rope was faſtned, transferring
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it to a Ring annexed to the lower part of the
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F
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rame of the upper
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Pulley, as we ſee it done in M. </
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<
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>Now finally, this Machine com
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pounded of upper and lower Pullies, is that which the Greeks call
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<
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">Τποχίλιον.</
foreign
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*Called by ſome
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a Nut.</
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<
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* Or two ends of
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the ſame Rope.</
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<
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In Latine
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Tro
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chlea.
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</
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<
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>We have hitherto explained, how by help of Pullies one may
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double the
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F
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orce, it remaineth that with the greateſt brevity poſ
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ſible, we ſhew the way how to encreaſe it according to any Multi
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plicity. </
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<
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>And firſt we will ſpeak of the Multiplicity according to
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the even numbers, and then the odde: To ſhew how we may mul
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tiply the
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F
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orce in a quadruple Proportion, we will propound the
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following Speculation as the Soul of all that followeth.</
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>
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<
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>Take two Leavers, A B, C D, with the
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type
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F
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emph.end
type
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"/>
ulciments in the ex
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<
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id
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id.040.01.982.2.jpg
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xlink:href
="
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number
="
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treams A and C; and at the middles
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of each of them let the Grave G hang,
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ſuſtained by two
<
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type
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F
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orces of equal Mo
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ment placed in B and D. </
s
>
<
s
>I ſay, that
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the Moment of each of them will
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equal the Moment of the fourth part
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of the Weight G.
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F
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or the two
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F
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or
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ces B and D bearing equally, it is
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manifeſt, that the
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type
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F
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orce D hath not
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contraſted with more then one half of the Weight G: But if the
<
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/>
<
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F
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orce D do by benefit of the Leaver D C ſuſtain the half of the </
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