Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

Table of figures

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            <p type="head">
              <s>DEFINITON III.</s>
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              <s>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.</s>
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              <s>DEFINITION IV.</s>
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              <s>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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                <figure id="id.040.01.614.1.jpg" xlink:href="040/01/614/1.jpg" number="45"/>
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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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                <arrow.to.target n="marg968"/>
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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.</s>
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              * Or Sluice.</s>
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            <p type="head">
              <s>DEFINITION V.</s>
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              <s>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. </s>
              <s>G H.</s>
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            <p type="head">
              <s>DEFINITION VI.</s>
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              <s>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.</s>
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