Galilei, Galileo, The systems of the world, 1661

Table of figures

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              but the part C at the ſame time is retarded in its motion, as be
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              ing deprived of the progreſſion dependant on the diurnal motion:
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              If we ſuppoſe, I ſay, a tract of Sea as long as the arch B C, we
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              have already ſeen, that its extreams ſhall move in the ſame time
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              with great inequality. </s>
              <s>And extreamly different would the
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              cities of a tract of Sea be that is in length a ſemicircle, and
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              ced in the poſition B C D, in regard that the extream B would
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              be in a moſt accelerate motion, and the other D, in a moſt ſlow
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              one; and the intermediate parts towards C, would be in a
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              moderate motion. </s>
              <s>And according as the ſaid tracts of Sea ſhall
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              be ſhorter, they ſhall leſſe participate of this extravagant
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              dent, of being in ſome hours of the day with their parts diverſly
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              affected by velocity and tardity of motion. </s>
              <s>So that, if, as in the firſt
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              caſe, we ſee by experience that the acceleration and retardation,
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              though equally imparted to all the parts of the conteining Veſſel,
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              is the cauſe that the water contained, fluctuates too and again, what
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              may we think would happen in a Veſſel ſo admirably diſpoſed,
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              that retardation and acceleration of motion is very unequally
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              contributed to its parts? </s>
              <s>Certainly we muſt needs grant that
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              greater and more wonderful cauſes of the commotions in the
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              Water ought to be looked for. </s>
              <s>And though it may ſeem
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              poſſible to ſome, that in artificial Machines and Veſſels we ſhould
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              be able to experiment the effects of ſuch an accident; yet
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              vertheleſſe it is not abſolutely impoſſible to be done; and I have
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              by me the model of an Engine, in which the effect of theſe
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              rable commixtions of motions may be particularly obſerved. </s>
              <s>But
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              as to what concerns our preſent purpoſe, that which you may
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              have hitherto comprehended with your imagination may
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              fice.</s>
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              <s>SAGR. </s>
              <s>I for my own particular very well conceive that this
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              admirable accident ought neceſſarily to evene in the Straights of
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              Seas, and eſpecially in thoſe that diſtend themſelves for a great
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              length from Weſt to Eaſt; namely according to the courſe of
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              the motions of the Terreſtrial Globe; and as it is in a certain
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              manner unthought of, and without a preſident among the
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              ons poſſible to be made by us, ſo it is not hard for me to believe,
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              that effects may be derived from the ſame, which are not to be
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              mitated by our artificial experiments.</s>
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              <s>SALV. </s>
              <s>Theſe things being declared, it is time that we
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              ceed to examine the particular accidents, which, together with
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              their diverſities, are obſerved by experience in the ebbing and
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              flowing of the waters. </s>
              <s>And firſt we need not think it hard to </s>
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              gueſſe whence it happeneth, that in Lakes, Pooles, and alſo in the
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              leſſer Seas there is no notable flux and reflux; the which hath
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              two very ſolid reaſons. </s>
              <s>The one is, that by reaſon of the </s>
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