Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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it ſhould run above an hundred yards, he would let the ball
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merge into the water, & freely deſcend, & diligently obſerve its
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tion. </
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<
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>If he would but do thus, he ſhould ſee, firſt, that it would go in a
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direct line towards that point of the bottom of the veſſel, whither it
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would tend, if the boat ſhould ſtand ſtill; & to his eye, and in
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tion to the veſſel, that motion would appear moſt ſtraight and
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pendicular, and yet he could not ſay, but that it would be compoſed
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of the right motion downwards, and of the circular about the
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ment of water. </
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<
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>And if theſe things befall in matters not natural,
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and in things that we may experiment in their ſtate of reſt; & then
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again in the contrary ſtate of motion, and yet as to appearance no
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diverſity at all is diſcovered, & that they ſeem to deceive our ſenſe
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what can we diſtinguiſh touching the Earth, which hath been
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petually in the ſame conſtitution, as to motion and reſt? </
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<
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>And in
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what time can we experiment whether any difference is diſcernable
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amongſt theſe accidents of local motion, in its diverſe ſtates of
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tion and reſt, if it eternally indureth in but one onely of them?</
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An experiment
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that ſheweth how
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the common motion
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is imperceptible.
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<
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>SAGR. </
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>Theſe Diſcourſes have ſomewhat whetted my ſtomack,
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which thoſe fiſhes, and ſnails had in part nauſeated; and the former
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made me call to minde the correction of an errour, that hath ſo
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much appearance of truth, that I know not whether one of a
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thouſand would refuſe to admit it as unqueſtionable. </
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<
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>And it was
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this, that ſailing into
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Syria,
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and carrying with me a very good
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Teleſcope,
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that had been beſtowed on me by our
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Common Friend,
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who not many dayes before had invented, I propoſed to the
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riners, that it would be of great benefit in Navigation to make uſe
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of it upon the round top of a ſhip, to diſcover and kenne Veſſels
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afar off. </
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>The benefit was approved, but there was objected the
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difficulty of uſing it, by reaſon of the Ships continual fluctuation;
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and eſpecially on the round top, where the agitation is ſo much
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greater, and that it would be better for any one that would make
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uſe thereof to ſtand at the Partners upon the upper Deck, where
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the toſſing is leſſe than in any other place of the Ship. </
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<
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>I (for I
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will not conceal my errour) concurred in the ſame opinion, and
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for that time ſaid no more: nor can I tell you by what hints I was
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moved to return to ruminate with my ſelf upon this buſineſſe, and
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in the end came to diſcover my ſimplicity (although excuſable) in
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admitting that for true, which is moſt falſe; falſe I ſay, that the
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great agitation of the basket or round top, in compariſon of the
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ſmall one below, at the partners of the Maſt, ſhould render the
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uſe of the
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Teleſcope
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more difficult in finding out the object.</
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An ingenuous
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conſideration
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bout the poſſibility
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of uſing the
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cope
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with as much
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facility on the
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round top of the
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Maſt of a ſhip,
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as on the Deck.
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<
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>SALV. </
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<
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>I ſhould have accompanied the Mariners, and your ſelf
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at the beginning.</
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<
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>SIMP. </
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>And ſo ſhould I have done, and ſtill do: nor can I
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lieve, if I ſhould think of it an hundred years, that I could
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ſtand it otherwiſe.</
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