Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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light in the extremities, than in the middle parts.</
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<
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>SALV. </
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<
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>The doubt is ingenious and worthy of conſideration;
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and as it but juſt now came into your mind unawares, ſo I will
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like wiſe anſwer with what firſt comes into my thoughts, and it may
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happily fall out, that by thinking more upon it, I may ſtumble
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upon a better reply. </
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<
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>But before, that I labyrinth my ſelf any
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ther, it would be neceſſary, that we aſſure our ſelves by ſome
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periment, whether your objection prove in effect, what it ſeemeth
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to conclude in appearance; and therefore taking once more the
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ſame paper, and making it to incline, by bending a little part
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thereof upon the remainder, let us try whether expoſing it to the
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Sun, ſo that the rayes of light fall upon the leſſer part directly,
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and upon the other obliquely; this which receiveth the rayes
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ly appeareth more lucid; and ſee here by manifeſt experience,
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that it is notably more clear. </
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>Now if your objection be concluſive,
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it will follow, that ſtooping with our eye ſo, that in beholding
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the other greater part, leſs illuminated, in compreſſion or
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ſhortning, it appear unto us no bigger than the other, more ſhining;
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and that conſequently, it be not beheld at a greater angle than
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that; it will neceſſarily enſue, I ſay, that its light be encreaſed, ſo
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that it do ſeem to us as bright as the other. </
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<
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>See how I behold, and
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look upon it ſo obliquely, that it appeareth to me narrower than
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the other; but yet, notwithſtanding its obſcurity, doth not to
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my perceiving, at all grow clearer. </
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<
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>Try now if the ſame ſucceed
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to you.</
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>SAGR. </
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>I have look't upon it, and though I have ſtooped with
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my eye, yet cannot I ſee the ſaid ſuperficies encreaſe in light or
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clarity; nay me thinks it rather grows more dusky.</
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>SALV. </
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>We are hitherto confident of the invalidity of the
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jection; In the next place, as to the ſolution, I believe, that, by
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reaſon the Superficies of this paper is little leſſe than ſmooth, the
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rayes are very few, which be reflected towards the point of
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dence, in compariſon of the multitude, which are reflected
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wards the oppoſite parts; and that of thoſe few more and more
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are loſt, the nearer the viſive rayes approach to thoſe lucid rayes
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of incidence; and becauſe it is not the incident rayes, but thoſe
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which are reflected to the eye, that make the object appear
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minous; therefore, in ſtooping the eye, there is more loſt than got,
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as you your ſelf confeſſe to have ſeen in looking upon the
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rer part of the paper.</
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<
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>SAGR. </
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<
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>I reſt ſatisfied with this experiment and reaſon: It
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mains now, that
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Simplicius
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anſwer to my other queſtion, and tell
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me what moves the
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Peripateticks
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to require this ſo exact rotundity
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in the Cœleſtial bodies.</
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<
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>SIMPL. </
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<
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>The Cœleſtial bodies being ingenerable, inalterable, </
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