Castelli, Benedetto
,
Of the mensuration of running waters
,
1661
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>Now touching this, I had the fortune to offer an admirable
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accident that we meet with when we come to the effect, which
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I verily believe will be an utter ruine to the Lake of
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Ve
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nice.
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>I ſay therefore, that by diverting theſe five Rivers that re
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main, although their water that they diſcharge for the preſent in
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to the Lake is not all taken together 4/5 parts of what the
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Brent
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alone did carry, yet nevertheleſſe the abatement of the water of
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the Lake which ſhall enſue upon this laſt diverſion of four parts,
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which was the whole water, ſhall prove double to that which hath
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happened by the diverſion of
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Brent
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onely, although that the
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Brent
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alone carried five parts of that water, of which the Rivers
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that are to be diverted carry four: A wonder really great, and
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altogether unlikely; for the reducing all this Propoſition to be
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underſtood, is as if we ſhould ſay, that there being given us
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three Rivers, of which the firſt diſchargeth five parts, the ſecond
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three, and the third one, and that from the diverſion of the
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firſt, there did follow ſuch a certain abatement or fall; from
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the taking away of the ſecond there ought to follow alſo ſo
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much more abatement; And laſtly, from the withdrawing of
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the third the water ought to fall ſo much more, which is wholly
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impoſſible: And yet it is moſt certain, and beſides the demon
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ſtration that perſwades me to it, which I ſhall explain in due
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time, I can ſet before your eyes ſuch an experiment as is not to
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be denied by any one, although obſtinate: and I will make it
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plainly ſeen and felt, that by taking away only four parts of the
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five, which ſhall have been taken away, the abatement proveth
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double to the abatement enſuing upon the diverting firſt of the
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five onely; which thing being true, as moſt certainly it is, it
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will give us to underſtand how pernicious this diverſion of five
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Rivers is like to prove, if it ſhall be put in execution.</
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>By this little that I have hinted, and the much that I could
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ſay, let your Highneſſe gather with what circumſpection this bu
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ſineſſe ought to be managed, and with how great skill he ought
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to be furniſhed who would behave himſelf well in theſe difficult
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affairs.</
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>I have not at this time explained the demonſtration, nor have
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I ſo much as propounded the way to make the Experiment, that
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I am able to make in confirmation of what I have ſaid, that ſo
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by ſome one or others miſ-apprehending the Demonſtration,
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and maiming the Experiment, the truth may not happen to ſhine
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with leſſe clarity than it doth, when all miſts of difficulty are re
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moved: and if ſo be, no account ſhould be made of the Reaſons
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by me alledged, and that men ſhould ſhut their eyes againſt the
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Experiments that without coſt or charge may be made, I do de</
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