Castelli, Benedetto
,
Of the mensuration of running waters
,
1661
Text
Text Image
Image
XML
Thumbnail overview
Document information
None
Concordance
Figures
Thumbnails
List of thumbnails
<
1 - 10
11 - 20
21 - 30
31 - 40
41 - 50
51 - 60
61 - 70
71 - 80
81 - 90
91 - 100
101 - 110
111 - 120
121 - 130
131 - 137
>
61
62
63
64
65
66
67
68
69
70
<
1 - 10
11 - 20
21 - 30
31 - 40
41 - 50
51 - 60
61 - 70
71 - 80
81 - 90
91 - 100
101 - 110
111 - 120
121 - 130
131 - 137
>
page
|<
<
of 137
>
>|
<
archimedes
>
<
text
>
<
body
>
<
chap
>
<
p
type
="
main
">
<
s
>
<
pb
xlink:href
="
068/01/108.jpg
"
pagenum
="
94
"/>
more than it did at the level AF, it would riſe yet more above
<
lb
/>
the ſaid level A F; although that the ſelf ſame quantity of water
<
lb
/>
runneth all the while. </
s
>
<
s
>By the above-named ſolid Principle I
<
lb
/>
reſolve extravagant Problems in my Treatiſe, and aſſign the Rea
<
lb
/>
ſons of admirable effects of Running Waters: But as for what
<
lb
/>
concerneth our purpoſe of the
<
emph
type
="
italics
"/>
Pontine Fenns,
<
emph.end
type
="
italics
"/>
we have the Cau
<
lb
/>
ſes very plain and clear; for which, by the trampling of Cattle
<
lb
/>
which paſs thorow the
<
emph
type
="
italics
"/>
Draining River,
<
emph.end
type
="
italics
"/>
the waters abate ſo nota
<
lb
/>
bly, that it is as it were a miracle for thoſe Reeds, Flags, and
<
lb
/>
Weeds that ſpring up, encreaſe, and ſpread all over the River,
<
lb
/>
ſtop and impede that velocity of the waters which they would
<
lb
/>
have by means of their declivity. </
s
>
<
s
>But that paſſage of thoſe Beaſts,
<
lb
/>
treading down thoſe Weeds unto the bottom of the River, in ſuch
<
lb
/>
ſort, as that they no longer hinder the Current of the Water;
<
lb
/>
and the ſame Waters increaſing in their courſe, they do dimi
<
lb
/>
niſh in meaſure and height; and by this meanes the Ditches of the
<
lb
/>
Plains empty into the ſame ſucceſsfully, and leave them free
<
lb
/>
from Waters, and Drained. </
s
>
<
s
>But theſe Weeds in a ſhort
<
lb
/>
time ſprouting up anew, and raiſing their ſtalkes thorow the
<
lb
/>
body of the Waters, they reduce things to the ſame evil
<
lb
/>
ſtate, as before, retarding the velocity of the Water, ma
<
lb
/>
king it to increaſe in height, and perhaps do occaſion grea
<
lb
/>
ter miſchiefs; ſeeing that thoſe many knots which each plant
<
lb
/>
ſhoots forth, begets a greater multitude of Stalks, which much
<
lb
/>
more incumbering the Water of the River, are a greater impe
<
lb
/>
diment unto its velocity, and conſequently make the height
<
lb
/>
of the waters to encreaſe ſo much the more, and do more miſchief
<
lb
/>
than before.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>Another head to which theſe harms may be reduced, but pro
<
lb
/>
ceeding from the ſame Root, which hath a great part in this
<
lb
/>
diſorder, is the impediment of thoſe Wears in the River which
<
lb
/>
are made by heightning the bed of the ſame, for placing of fiſh
<
lb
/>
ing-nets; of which
<
emph
type
="
italics
"/>
Piſcaries
<
emph.end
type
="
italics
"/>
I reckoned above ten, when I made
<
lb
/>
a voyage thorow thoſe waters to
<
emph
type
="
italics
"/>
Sandolo.
<
emph.end
type
="
italics
"/>
And theſe Fiſhing
<
lb
/>
Wears are ſuch impediments, that ſome one of them makes the
<
lb
/>
water of the River in the upper part to riſe half a Palm, and
<
lb
/>
ſometimes a whole Palm, and more; ſo that when they are all
<
lb
/>
gathered together, theſe impediments amount to more than ſeven,
<
lb
/>
or poſſibly than eight Palms.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>There concurreth for a third moſt Potent Cauſe of the waters
<
lb
/>
continuing high in the evacuating, or Draining Chanel, and con
<
lb
/>
ſequently on the Plains; The great abundance of water that iſſu
<
lb
/>
eth from
<
emph
type
="
italics
"/>
Fiume Siſto,
<
emph.end
type
="
italics
"/>
the waters of which do not keep within its
<
lb
/>
Banks when they are abundant; but encreaſing above its Chanel,
<
lb
/>
they unite with thoſe of the Evacuator, and diſperſing thorow </
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>