Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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>OF THE
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MENSURATION
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OF
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Running Waters.</
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Lib.
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II.</
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>Having, in the cloſe of my Treatiſe of the
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Menſuration of Running Waters promiſed
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to declare upon another occaſion other par
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ticulars more obſcure, and of very great
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concern upon the ſame argumement: I now
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do perform my promiſe on the occaſion
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that I had the paſt year 1641. to propound
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my thoughts touching the ſtate of the Lake
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of
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Venice,
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a buſineſs certainly moſt important, as being the
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concernment of that moſt noble and moſt admirable City; and
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indeed of all
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Italy,
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yea of all
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Europe, Aſia, & Africa
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; & one may
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truly ſay of all the whole World. </
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>And being to proceed according
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to the method neceſſary in Sciences, I wil propoſe, in the firſt place
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certain Definitions of thoſe Terms whereof we are to make uſe
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in our Diſcourſe: and then, laying down certain Principles we
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will demonſtrate ſome Problemes and Theoremes neceſſary for
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the underſtanding of thoſe things which we are to deliver; and
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moreover, recounting ſundry caſes that have happened, we will
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prove by practice, of what utility this contemplation of the
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Meaſure of Running Waters is in the more important affairs both
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Publique and Private.</
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>DEFINITION I.</
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>Two Rivers are ſaid to move with equal velocity, when in e
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qual times they paſſe ſpaces of equal length.</
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<
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>DEFINITION II.</
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>Rivers are ſaid to move with like velocity, when their propor
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tional parts do move alike, that is, the upper parts alike to
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the upper, and the lower to the lower; ſo that if the upper
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part of one River ſhall be more ſwift than the upper part of ano
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ther; then alſo the lower part of the former ſhall be more ſwift
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than the part correſpondent to it in the ſecond, proportionally.</
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