Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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<
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>SALV. </
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<
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>See here is the glaſſe, which I would have to be placed
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cloſe to the other. </
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<
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>But firſt let us go yonder towards the reflection
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of that flat one, and attentively obſerve its clarity; ſee how
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bright it is here where it ſhines, and how diſtinctly one may diſcern
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theſe ſmall unevenneſſes in the Wall.</
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<
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>SIMPL. </
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<
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>I have ſeen and very well obſerved the ſame, now place
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the other glaſſe by the ſide of the firſt.</
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<
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>SALV. </
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<
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>See where it is. </
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<
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>It was placed there aſſoon as you
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gan to look upon the Walls ſmall unevenneſſes, and you
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ved it not, ſo great was the encreaſe of the light all over the reſt of
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the Wall. </
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<
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>Now take away the flat glaſſe. </
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<
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>Behold now all
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ction removed, though the great convex glaſſe ſtill remaineth.
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</
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<
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>Remove this alſo, and place it there again if you pleaſe, and you
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ſhall ſee no alteration of light in all the Wall. </
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<
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>See here then
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monſtrated to ſenſe, that the reflection of the Sun, made upon a
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ſpherical convex glaſſe, doth not ſenſibly illuminate the places neer
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unto it. </
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<
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>Now what ſay you to this experiment?</
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<
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>SIMPL. </
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<
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>I am afraid that there may be ſome
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Leigerdemain,
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uſed in this affair; yet in beholding that glaſſe I ſee it dart forth
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a great ſplendor, which dazleth my eyes; and that which
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ports moſt of all, I ſee it from what place ſoever I look upon it;
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and I ſee it go changing ſituation upon the ſuperficies of the glaſſe,
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which way ſoever I place my ſelf to look upon it; a neceſſary
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gument, that the light is livelily reflected towards every ſide, and
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conſequently, as ſtrongly upon all that Wall, as upon my eye.</
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<
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>SALV. </
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<
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>Now you ſee how cautiouſly and reſervedly you ought
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to proceed in lending your aſſent to that, which diſcourſe alone
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preſenteth to you. </
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<
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>There is no doubt but that this which you ſay,
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carrieth with it probability enough, yet you may ſee, how
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ble experience proves the contrary.</
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<
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>SIMPL. </
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<
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>How then doth this come to paſs?</
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<
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>SALV. </
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<
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>I will deliver you my thoughts thereof, but I cannot
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tell how you may be pleaſ'd therewith. </
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<
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>And firſt, that lively
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ſplendor which you ſee upon the glaſs, and which you think
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pieth a good part thereof, is nothing near ſo great, nay is very
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ceeding ſmall; but its livelineſs occaſioneth in your eye, (by means
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of the reflection made on the humidity of the extream parts of the
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eye-brows, which diſtendeth upon the pupil) an adventitious
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ation, like to that blaze which we think we ſee about the flame of
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a candle placed at ſome diſtance; or if you will, you may
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reſemble it to the adventitious ſplendor of a ſtar; for if you ſhould
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compare the ſmall body
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v. </
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<
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>g.
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of the
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Canicula,
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ſeen in the day time
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with the
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Teleſcope,
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when it is ſeen without ſuch irradiation, with
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the ſame ſeen by night by the eye it ſelf, you will doubtleſs
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prehend that being irradiated, it appeareth above a thouſand </
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