Galilei, Galileo
,
Mechanics
,
1665
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wherewith it ſelf doth move; which we affirm abſolutely to be
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impoſſible to be done with any Machine imaginable. </
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<
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>But becauſe
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it may ſometimes come to paſſe, that having but little Force, it is
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required to move a great Weight all at once, without dividing it
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in pieces, on this occaſion it will be neceiſary to have recourſe to
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the Machine, by means whereof the propoſed Weight may be
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transferred to the aſſigned Space by the Force given. </
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<
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>But yet
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this doth not hinder, but that the ſame Force is to move, meaſuring
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that ſame Space, or another equall to it, as many ſeverall times as
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it is exceeded by the ſaid Weight. </
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<
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>So that in the end of the a
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ction we ſhall ſind that we have received from the Machine no
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other benefit tnen only that of tranſporting the ſaid Weight with
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the given Force to the Term given, all at once. </
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<
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>Which Weight,
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being divided into parts, would without any Machine have been
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carried by the ſame Force, in the ſame Time, through the ſame
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Intervall. </
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>And this ought to paſſe for one of the benefits taken
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from the Mechanicks: for indeed it frequently happens, that be
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ing ſcanted in Force but not Time, we are put upon moving great
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Weights unitedly or in groſſe: but he that ſhould hope, and at
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tempt to do the ſame by the help of Machines without increaſe of
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Tardity in the Moveable, would certainly be deceived, and would
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declare his ignorance of the uſe of Mechanick Inſtruments, and
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the reaſon of their effects.</
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>Another benefit is drawn from the Inſtruments, which depend
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eth on the place wherein the operation is to be made: for all In
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ſtruments cannot be made uſe of in all places with equall conve
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nience. </
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>And ſo we ſee (to explain our ſelves by an example) that
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for drawing of Water out of a Well, we make uſe of onely a
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Rope and a Bucket fitted to receive and hold Water, wherewith
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we draw up a determinate quantity of Water, in a certain Time,
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with our limited ſtrength: and he that ſhould think he could with
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a Machine of whatſoever Force, with the ſame ſtrength, and in
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the ſame Time, take up a great quantity of Water, is in a groſſe
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Errour. </
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>And he ſhall find himſelf ſo much the more deceived,
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the more he ſhall vary and multiply his Inventions: Yet never
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theleſſe we ſee Water drawn up with other Engines, as with a Pump
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that drinks up Water in the Hold of Ships; where you muſt note
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that the Pump was not imployed in thoſe Offices, for that it draws
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up more Water in the ſame Time, and with the ſame ſtrength
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then that which a bare Bucket would do, but becauſe in that place
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the uſe of the Bucket or any ſuch like Veſſel could not effect what
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is deſired, namely to keep the Hold of the Ship quite dry from e
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very little quantity of Water; which the Bucket cannot do, for
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that it cannot dimerge and dive, where there is not a conſiderable
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depth of Water. </
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<
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>And thus we ſee the Holds of Ships by the </
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