Castelli, Benedetto
,
Of the mensuration of running waters
,
1661
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>DEFINITON III.</
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>To meaſure a River, or running Water, is in our ſenſe to finde
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out how many determinate meaſures, or weights of Water
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in a given time paſſeth through the River, or Channel of the
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Water that is to be meaſured.</
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<
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>DEFINITION IV.</
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>If a Machine be made either of Brick, or of Stone, or of
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Wood, ſo compoſed that two ſides of the ſaid Machine be
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placed at right angles upon the ends of a third ſide, that is
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ſuppoſed to be placed in the bottom of a River, parallel to the
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Horizon, in ſuch a manner, that all the water which runneth
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through the ſaid River, paſſeth thorow the ſaid Machine: And
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if all the water coming to be diverted
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that runneth through the ſaid River, the
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upper ſuperficies of that third ſide placed
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in the bottom do remain uncovered
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and dry, and that the dead water be not
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above it; This ſame Machine ſhall be
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called by us ^{*} REGULATOR: And that third ſide of the
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Machine which ſtandeth Horizontally is called the bottom of
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the Regulator; and the other two ſides, are called the banks of
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the Regulator; as is ſeen in this firſt Figure: A B C D, ſhall be
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the Regulator; B C the bottom; and the other two ſides A B,
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and C D are its banks.</
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* Or Sluice.</
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>DEFINITION V.</
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>By the quick height, we mean the Perpendicular from the upper
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ſuperficies of the River, unto the upper ſuperficies of the bot
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tom of the Regulator; as in the foregoing Figure the line. </
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<
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>G H.</
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>DEFINITION VI.</
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>If the water of a
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R
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iver be ſuppoſed to be marked by three
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ſides of a Regulator, that Rightangled Parallelogram compre
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hended between the banks of the Regulator, and the bottom,
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and the ſuperficies of the Water is called a Section of the
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River.</
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