Castelli, Benedetto, Of the mensuration of running waters, 1661

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1without the leaſt errour; which Rule was taught me by my
Maſter Sign. Galilæo Galilæi, Chief Philoſopher to the moſt Se­
rene Grand Duke of Tuſcany. And this way will ſerve eaſily and
admirably to our purpoſe and occaſion; ſo that we ſhall
thereby be able to know how many Quarts of Water an A­
queduct will diſcharge in a given time of hours, moneths, or
years.
And in this manner we may conſtitute a Cock that ſhall
diſcharge a certain and determinate quantity of water in a time
given.
And becauſe daily experience ſhews us, that the Springs of A­
queducts do not maintain them alwayes equally high, and full
of Water, but that ſometimes they increaſe, and ſometimes de­
creaſe, which accident might poſſibly procure ſome difficulty in
our diſtribution: Therefore, to the end that all manner of ſcru­
ple may be removed, I conceive that it would be convenient to
provide a Ciſtern, according to the occaſion, into which there
might alwayes fall one certain quantity of water, which ſhould
not be greater than that which the principal pipe diſchargeth in
times of drought, when the Springs are bare of water, that ſo in
this Ciſtern the water might alwayes keep at one conſtant height.
Then to the Ciſtern ſo prepared we are to faſten the Cocks of
particular perſons, to whom the Water is ſold by the Reverend
Apoſtolique Chamber, according to what hath been obſerved
before; and that quantity of Water which remaineth over and
above, is to be diſcharged into another Ciſtern, in which the
Cocks of the Waters for publick ſervices, and of thoſe which
people buy upon particular occaſions are to be placed.
And
when the buſineſſe ſhall have been brought to this paſſe, there
will likewiſe a remedy be found to the ſo many diſorders that
continually happen; of which, for brevity ſake, I will inſtance
in but four only, which concern both publique and private bene­
fit, as being, in my judgment, the moſt enormous and intole­
rable.
The firſt inconvenience is, that in the common way of meaſu­
ring, diſpenſing, and ſelling the Waters of Aqueducts, it is not
underſtood, neither by the Buyer nor Seller, what the quantity
truly is that is bought and ſold; nor could I ever meet with any
either Engineer or Architect, or Artiſt, or other that was able to
decypher to me, what one, or two, or ten inches of water was.
But by our above declared Rule, for diſpenſing the Waters of
Aqueducts we may very eaſily know the true quantity of Water
that is bought or ſold, as that it is ſo many Tuns an hour, ſo ma­
ny a day, ſo many in a year, &c.
The ſecond diſorder that happeneth, at preſent, in the diſtri­

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