Galilei, Galileo
,
Mechanics
,
1665
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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.</
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>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. </
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>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. </
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>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.</
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>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.</
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