Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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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. </
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<
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>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. </
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<
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>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. </
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<
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>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? </
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<
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>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. </
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<
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>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. </
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<
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>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.</
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<
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>SAGR. </
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>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.</
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>SALV. </
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>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. </
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>And firſt we need not think it hard to </
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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. </
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<
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>The one is, that by reaſon of the </
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