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

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1ning Water is reputed in ſome ſenſe infinite, in that it never cea­
ſeth to move away, and as infinite is judged incomprehenſible;
and ſuch as that there is no exact knowledge to be had thereof;
& ſo there comes to be no account made thereof; but if we ſhould
make ſtrict reflection upon our conſideration of the velocity of
Water, we ſhould find, that keeping account of the ſame, there
is a reckoning alſo made of the length; foraſmuch as whilſt we
ſay, the Water of ſuch a Spring runs with the velocity of paſſing
a thouſand or two thouſand paces an hour: this in ſubſtance is
no other than if we had ſaid, ſuch a Fountain diſchargeth in an
hour a Water of a thouſand or two thouſand paces long.
So
that, albeit the total length of Running water be incomprehen­
ſible, as being infinite, yet nevertheleſſe its rendered intelligible
by parts in its velocity.
And ſo much ſufficeth to have hinted
about this matter, hoping to impart on ſome other occaſion other
more accurate Obſervations in this affair.
LAVS DEO.
5[Figure 5]

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