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 15]
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[Figure 16]
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[Figure 17]
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[Figure 18]
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[Figure 19]
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[Figure 20]
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[Figure 21]
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[Figure 22]
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[Figure 23]
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[Figure 24]
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[Figure 25]
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[Figure 26]
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[Figure 27]
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[Figure 28]
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[Figure 29]
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we will ſet before you the preſent Contemplation. </
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>Suppoſe, there
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fore, that A B, C D, and E F are three Leavers; and that on the
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middle points of them G, H, and I the Weight K doth hang in
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common, ſo that every one of them ſhall ſuſtain the third part of
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it: And becauſe the Power in
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B, ſuſtaining with the Leaver
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B A thependent Weight in G,
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hapneth to be the half of the
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ſaid Weight, and it hath been
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already ſaid, that it ſuſtaineth
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the third part of the Weight
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K: Therefore the Moment of
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the Force B is equal to half of
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the third part of the Weight K; that is, to the ſixth part of it:
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And the ſame ſhall be demonſtrated of the other Forces D and F:
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From whence we may eaſily gather, that putting three Gyrils or
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Rundles into the inferiour Pulley, and two or three into the upper
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moſt, we may multiply the Force accor
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ding to our ^{*}
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Senarius.
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And if we would
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encreaſe it according to any other even
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Number, the Gyrils of the Pulley below
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muſt be multiplyed according to the half
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of that Number, according to which the
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Force is to be multiplyed, circumpoſing
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the Rope about the Pulleys, ſo as that one
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of the ends be faſtned to the upper Pul
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ley, and let the Force be in the other; as
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in this Figure adjoyning may manifeſtly
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be gathered.</
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* Or in Sexcuple
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proportion.</
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<
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>Now paſſing to the Declaration of the
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manner how to multiply the Force ac
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cording to the odd Numbers, and begin
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ning at the triple proportion: firſt, let us
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propoſe the preſent Contemplation, as
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that, on the underſtanding of which the
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knowledge of all the Work in hand
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doth depend. </
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<
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>Let therefore the Leaver
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be A B, its Fulciment A, and from the
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middle of it, that is, at the point C let
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the Grave D be hanged; and let it be ſu
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ſtained by two equal Forces; and let one of them be applied to the
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point C, and the other to the term B. </
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<
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>I ſay, that each of thoſe Powers
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have Moment equal to the third part of the Weight D. </
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<
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>For the
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Force in C ſuſtaineth a Weight equal to it ſelf, being placed in the
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ſame Line in which the Weight D doth hang & Gravitate: But the </
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