Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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inſtant, and its poſſible it may be a commixtion of my own
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ceipts; and thoſe which I have ſometime read in the fore-ſaid
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Books, by which I well remember, that I was then perfectly
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ſatisfied, although the concluſions, at firſt ſight ſeem'd unto me
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ſtrange Paradoxes. </
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<
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>We enquire
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Simplicius,
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whether to the
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king a reflection of light, like that which we receive from the
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Moon, it be neceſſary that the ſuperficies from whence the
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ction commeth, be ſo ſmooth and polite, as the face of a
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Glaſſe, or whether a ſuperficies not ſmooth or poliſht, but rough
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and uneven, be more apt for ſuch a purpoſe. </
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<
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>Now ſuppoſing
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two reflections ſhould come unto us, one more bright, the other
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leſſe, from two ſuperficies oppoſite unto us, I demand of you,
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which of the two ſuperficies you think would repreſent it ſelf to
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our ſight, to be the cleareſt, and which the obſcureſt.</
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<
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>SIMPL. </
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<
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>I am very confident, that that ſame, which moſt
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cibly reflected the light upon me, would ſhew its ſelf in its aſpect
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the clearer, and the other darker.</
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>SALV. </
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>Be pleaſed to take that Glaſſe which hangs on yonder
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Wall, and let us go out into the Court-yard. </
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<
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>Come
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Sagredus.
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Now hang the glaſſe yonder, againſt that ſame Wall, on which
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the Sun ſhines, and now let us with-draw our ſelves into the ſhade.
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</
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<
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>See yonder two ſuperficies beaten by the Sun, namely, the Wall
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and the Glaſſe. </
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<
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>Tell me now which appears cleareſt unto you,
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that of the Wall or that of the Glaſſe? </
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<
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>Why do you not anſwer
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me?</
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It is proved at
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large that the
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Moons ſurface is
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ſharp.
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<
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>SAGR. </
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<
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>I leave the reply to
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Simplicius,
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who made the
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on; but I, for my own part, am perſwaded upon this ſmall
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ginning of the experiment, that the Moon muſt be of a very
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poliſht ſurface.</
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<
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>SALV. </
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<
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>What ſay you
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Simplicius,
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if you were to depaint that
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Wall, and that Glaſſe faſtened unto it, where would you uſe
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your darkeſt colours, in deſigning the Wall, or elſe in painting
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the Looking-Glaſſe.</
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<
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>SIMPL. </
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<
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>Much the darker in depainting the Glaſſe.</
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<
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>SALV. </
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<
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>Now if from the ſuperficies, which repreſents it ſelf
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more clear, there proceedeth a more powerful reflection of light,
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the Wall will more forcibly reflect the raies of the Sun, than the
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Glaſſe.</
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<
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>SIMPL. </
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<
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>Very well, Sir, have you ever a better experiment
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than this? </
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>
<
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>you have placed us where the Glaſſe doth not
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berate upon us; but come along with me a little this way; how,
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will you not ſtir?</
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<
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>SAGR. </
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<
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>You perhaps ſeek the place of the reflection, which the
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Glaſſe makth.</
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<
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>SIMPL. </
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<
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>I do ſo.</
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