Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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211 - 240
241 - 270
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ſhould maintain themſelves the ſame in
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Tiber,
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which by his leave,
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is moſt falſe, when ever thoſe waters reduced into
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Tiber,
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retain
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not the ſame velocity which they had in the place in which
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Fon
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tana
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and his Nephew meaſured them: And all this is manifeſt
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from the things which we have above explained; for, if the Wa
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ters reduced into
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Tiber
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increaſe in velocity, they decreaſe in mea
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ſure; and if they decreaſe in velocity, they increaſe in mea
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ſure.</
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>Secondly, I conſider that the meaſures of thoſe Brooks and
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Rivers, which enter into
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Tiber
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at the time of Innundation, are
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not between themſelves really the ſame, when their velocities are
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not equal, though they have the ſame names of Ells and Feet;
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for that its poſſible that a diſinboguement of ten Ells requadrated
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(to ſpeak in the phraſe of
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Fontana
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) of one of thoſe Brooks,
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might diſcharge into
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Tiber
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at the time of Innundation, four, ten,
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and twenty times leſs Water, than another mouth equal to the
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firſt in greatneſs, as would occur when the firſt mouth were four,
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ten, or twenty times leſs ſwift than the ſecond. </
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<
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>Whereupon,
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whilſt
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Fontana
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ſummes up the Ells and Feet of the meaſures of
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thoſe Brooks and Rivers into a total aggregate, he commits the
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ſame error with him, which would add into one ſumme diverſe
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moneys of diverſe values, and diverſe places, but that had the
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ſame name; as if one ſhould ſay ten Crowns of
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Roman
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money,
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four Crowns of Gold, thirteen Crowns of
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Florence,
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five Growns
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of
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Venice,
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and eight Crowns of
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Mantua,
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ſhould make the ſame
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ſumme with forty Crowns of Gold, or forty Crowns of
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Mantua.
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<
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>Thirdly, It might happen that ſome River or Current in the
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parts nearer
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Rome,
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in the time of its flowing, did not ſend forth
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more Water than ordinary; and however, its a thing very clear,
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that whilſt the ſtream came from the ſuperior parts, that ſame
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Brook or River would be augmented in meaſure, as hath been
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noted in the fourth
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Corollary
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; in ſuch ſort, that
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Fontana
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might
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have inculcated, and noted that ſame River or Current as con
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curring to the Innundation, although it were therein altogether
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unconcerned.</
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<
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>Moreover, in the fourth place we muſt note, That it might
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ſo fall out, that ſuch a River not onely was unintereſſed in the
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Innundation, though augmented in meaſure, but it might I ſay
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happen, that it was inſtrumental to the aſſwaging the Innunda
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tion, by augmenting in the meaſure of its own Channel; which
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matter is ſufficiently evident; for if it be ſuppoſed that the Ri
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ver in the time of flood, had not had of it ſelf, and from its pro
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per ſprings more Water than ordinary, its a thing certain, that
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the Water of
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Tiber
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riſing and increaſing; alſo that River, to le
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vel it ſelf with the Water of
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Tiber,
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would have retained ſome of </
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