Galilei, Galileo, Mechanics, 1665

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              <s>
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              ſaid Inſtrument kept dry, when Water cannot but onely oblique­
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              ly be drawn up, which the ordinary uſe of the Bucket would not
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              effect, which riſeth and deſcends with its Rope perpendicu­
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              larly.</s>
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              <s>The third is a greater benefit, haply, then all the reſt that are
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              derived from Mechanick Inſtruments, and reſpects the aſſiſtance
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              which is borrowed of ſome Force exanimate, as of the ſtream of a
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              River, or elſe animate, but of leſſe expence by far, then that which
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              would be neceſſary for maintaining humane ſtrength: as when to
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              turn Mills, we make uſe of the Current of a River, or the ſtrength
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              of a Horſe, to effect that, which would require the ſtrength of five
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              or fix Men. </s>
              <s>And this we may alſo advantage our ſelves in raiſing
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              Water, or making other violent Motions, which muſt have been
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              done by Men, if there were no other helps; becauſe with one ſole
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              Veſſel we may take Water, and raiſe, and empty it where occaſion
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              requires; but becauſe the Horſe, or ſuch other Mover wanteth
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              Reaſon, and thoſe Inſtruments which are requiſite for holding and
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              emptying the Veſſel in due time, returning again to fill it, and one­
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              ly is endued with Force, therefore it's neceſſary that the Mecha­
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              nitian ſupply the naturall defect of that Mover, furniſhing it with
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              ſuch devices and inventions, that with the ſole application of it's
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              Force the defired effect may follow. </s>
              <s>And therein is very great
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              advantage, not becauſe that a Wheel or other Machine can enable
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              one to tranſport the ſame Weight with leſſe Force, and greater
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              Dexterity, or a greater Space than an equall Force, without thoſe
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              Inſtruments, but having Judgment and proper Organs, could have
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              done; but becauſe that the ſtream of a River coſteth little or
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              nothing, and the charge of keeping of an Horſe or other Beaſt,
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              whoſe ſtrength is greater then that of eight, or it may be more
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              Men, is far leſſe then what ſo many Men would be kept
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              for.</s>
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              <s>Theſe then are the benefits that may be derived from Mecha­
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              nick Inſtruments, and not thoſe which ignorant Engineers dream
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              of, to their own diſgrace, and the abuſe of ſo many Princes,
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              whilſt they undertake impoſſible enterprizes; of which, both
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              by the little which hath been hinted, and by the much which
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              ſhall be demonſtrated in the Progreſſe of this Treatiſe, we ſhall
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              come to aſſure our ſelves, if we attentively heed that which ſhall
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              be ſpoken.</s>
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          </chap>
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