DEFINITON III.
To meaſure a River, or running Water, is in our ſenſe to finde
out how many determinate meaſures, or weights of Water
in a given time paſſeth through the River, or Channel of the
Water that is to be meaſured.
out how many determinate meaſures, or weights of Water
in a given time paſſeth through the River, or Channel of the
Water that is to be meaſured.
DEFINITION IV.
If a Machine be made either of Brick, or of Stone, or of
Wood, ſo compoſed that two ſides of the ſaid Machine be
placed at right angles upon the ends of a third ſide, that is
ſuppoſed to be placed in the bottom of a River, parallel to the
Horizon, in ſuch a manner, that all the water which runneth
through the ſaid River, paſſeth thorow the ſaid Machine: And
if all the water coming to be diverted
45[Figure 45]
that runneth through the ſaid River, the
upper ſuperficies of that third ſide placed
in the bottom do remain uncovered
and dry, and that the dead water be not
above it; This ſame Machine ſhall be
called by us ^{*} REGULATOR: And that third ſide of the
Machine which ſtandeth Horizontally is called the bottom of
the Regulator; and the other two ſides, are called the banks of
the Regulator; as is ſeen in this firſt Figure: A B C D, ſhall be
the Regulator; B C the bottom; and the other two ſides A B,
and C D are its banks.
Wood, ſo compoſed that two ſides of the ſaid Machine be
placed at right angles upon the ends of a third ſide, that is
ſuppoſed to be placed in the bottom of a River, parallel to the
Horizon, in ſuch a manner, that all the water which runneth
through the ſaid River, paſſeth thorow the ſaid Machine: And
if all the water coming to be diverted
45[Figure 45]that runneth through the ſaid River, the
upper ſuperficies of that third ſide placed
in the bottom do remain uncovered
and dry, and that the dead water be not
above it; This ſame Machine ſhall be
called by us ^{*} REGULATOR: And that third ſide of the
Machine which ſtandeth Horizontally is called the bottom of
the Regulator; and the other two ſides, are called the banks of
the Regulator; as is ſeen in this firſt Figure: A B C D, ſhall be
the Regulator; B C the bottom; and the other two ſides A B,
and C D are its banks.
* Or Sluice.
DEFINITION V.
By the quick height, we mean the Perpendicular from the upper
ſuperficies of the River, unto the upper ſuperficies of the bot
tom of the Regulator; as in the foregoing Figure the line. G H.
ſuperficies of the River, unto the upper ſuperficies of the bot
tom of the Regulator; as in the foregoing Figure the line. G H.
DEFINITION VI.
If the water of a River be ſuppoſed to be marked by three
ſides of a Regulator, that Rightangled Parallelogram compre
hended between the banks of the Regulator, and the bottom,
and the ſuperficies of the Water is called a Section of the
River.
ſides of a Regulator, that Rightangled Parallelogram compre
hended between the banks of the Regulator, and the bottom,
and the ſuperficies of the Water is called a Section of the
River.