Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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the line I; and as the velocity of D F is to the velocity of A B,
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ſo let the line I be to the line L; becauſe therefore the two
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Sections A B and G are equally ſwift, and diſcharge equal quan
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tity of Water in equal times, they ſhall be equal Sections; and
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therefore the height of A
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B
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to the height of G, ſhall be as the
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breadth of G, to the breadth of A
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B,
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that is, as E F to C
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B,
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that is, as the line H to the line I: but becauſe the Water which
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paſſeth through G, is equal to that which paſſeth through D E F,
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therefore the Section G, to the Section D E F, ſhall have the re
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ciprocal proportion of the velocity through D E F, to the velo
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city through G; but alſo the height of G, is to the height D E,
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as the Section G, to the Section D E F: Therefore the height of
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G, is to the height D E, as the velocity through D E F, is to the
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velocity through G; that is, as the velocity through D E F, is to
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the velocity through A
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B
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; That is, finally, as the line I, to the
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line L; Therefore, by equal proportion, the height of
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A B,
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that
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is, A C, ſhall be to the height D E; as H to L, that is, com
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pounded of the proportions of the breadth E F, to the breadth
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C
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B,
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and of the velocity through D F, to the velocity through
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A
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B
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: So that if a River fall into another River, &c. </
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<
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to be demonſtrated.</
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