Castelli, Benedetto, Of the mensuration of running waters, 1661
page |< < of 137 > >|
1
I ſay therefore, that by diverting theſe five Rivers that re­
main
, although their water that they diſcharge for the preſent in­
to
the Lake is not all taken together 4/5 parts of what the Brent
alone
did carry, yet nevertheleſſe the abatement of the water of
the
Lake which ſhall enſue upon this laſt diverſion of four parts,
which
was the whole water, ſhall prove double to that which hath
happened
by the diverſion of Brent onely, although that the
Brent alone carried five parts of that water, of which the Rivers
that
are to be diverted carry four: A wonder really great, and
altogether
unlikely; for the reducing all this Propoſition to be
underſtood
, is as if we ſhould ſay, that there being given us
three
Rivers, of which the firſt diſchargeth five parts, the ſecond
three
, and the third one, and that from the diverſion of the
firſt
, there did follow ſuch a certain abatement or fall; from
the
taking away of the ſecond there ought to follow alſo ſo
much
more abatement; And laſtly, from the withdrawing of
the
third the water ought to fall ſo much more, which is wholly
impoſſible
: And yet it is moſt certain, and beſides the demon­
ſtration
that perſwades me to it, which I ſhall explain in due
time
, I can ſet before your eyes ſuch an experiment as is not to
be
denied by any one, although obſtinate: and I will make it
plainly
ſeen and felt, that by taking away only four parts of the
five
, which ſhall have been taken away, the abatement proveth
double
to the abatement enſuing upon the diverting firſt of the
five
onely; which thing being true, as moſt certainly it is, it
will
give us to underſtand how pernicious this diverſion of five
Rivers
is like to prove, if it ſhall be put in execution.

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