Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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 - 140
141 - 150
151 - 160
161 - 170
171 - 180
181 - 190
191 - 200
201 - 210
211 - 220
221 - 230
231 - 240
241 - 250
251 - 260
261 - 270
271 - 280
281 - 290
291 - 300
301 - 310
311 - 320
321 - 330
331 - 340
341 - 350
351 - 360
361 - 370
371 - 380
381 - 390
391 - 400
401 - 410
411 - 420
421 - 430
431 - 440
441 - 450
451 - 460
461 - 470
471 - 480
481 - 490
491 - 500
501 - 510
511 - 520
521 - 530
531 - 540
541 - 550
551 - 560
561 - 570
571 - 580
581 - 590
591 - 600
601 - 610
611 - 620
621 - 630
631 - 640
641 - 650
651 - 660
661 - 670
671 - 680
681 - 690
691 - 700
701 - 701
>
491
492
493
494
495
496
497
498
499
500
<
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 - 140
141 - 150
151 - 160
161 - 170
171 - 180
181 - 190
191 - 200
201 - 210
211 - 220
221 - 230
231 - 240
241 - 250
251 - 260
261 - 270
271 - 280
281 - 290
291 - 300
301 - 310
311 - 320
321 - 330
331 - 340
341 - 350
351 - 360
361 - 370
371 - 380
381 - 390
391 - 400
401 - 410
411 - 420
421 - 430
431 - 440
441 - 450
451 - 460
461 - 470
471 - 480
481 - 490
491 - 500
501 - 510
511 - 520
521 - 530
531 - 540
541 - 550
551 - 560
561 - 570
571 - 580
581 - 590
591 - 600
601 - 610
611 - 620
621 - 630
631 - 640
641 - 650
651 - 660
661 - 670
671 - 680
681 - 690
691 - 700
701 - 701
>
page
|<
<
of 701
>
>|
<
archimedes
>
<
text
>
<
body
>
<
chap
>
<
p
type
="
main
">
<
s
>
<
pb
xlink:href
="
040/01/590.jpg
"
pagenum
="
21
"/>
the ſame water in paſſing under the Bridge, in our caſe meeteth
<
lb
/>
with eight of the ſame impediments, bearing, and thruſting upon
<
lb
/>
two ſides of each Arch (to omit the impediment of the bottom,
<
lb
/>
for that it is the ſame in the River, and under the Bridge) from
<
lb
/>
which inadvertency ſometimes follow very great diſorders, as
<
lb
/>
quotidian practice ſhews us.</
s
>
</
p
>
<
p
type
="
head
">
<
s
>APPENDIX IX.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>It is alſo worthy to conſider the great and admirable benefit
<
lb
/>
that thoſe fields receive, which are wont to drink up the Rain
<
lb
/>
water with difficulty, through the height of the water in the
<
lb
/>
principal Ditches; in which caſe the careful Husbandman cutteth
<
lb
/>
away the reeds and ruſhes in the Ditches, through which the
<
lb
/>
waters paſs; whereupon may be preſently ſeen, ſo ſoon as the
<
lb
/>
reeds and ruſhes are cut, a notable Ebb in the level of the water
<
lb
/>
in the Ditches; inſomuch that ſometimes it is obſerved, that the
<
lb
/>
water is abated after the ſaid cutting a third and more, of what it
<
lb
/>
was before the cutting. </
s
>
<
s
>The which effect ſeemingly might de
<
lb
/>
pend on this, That, before thoſe weeds took up room in the
<
lb
/>
Ditch, and for that cauſe the water kept a higher level, and the
<
lb
/>
ſaid Plants being afterwards cut and removed, the water came to
<
lb
/>
abate, poſſeſſing the place that before was occupied by the
<
lb
/>
weeds: Which opinion, though probable, and at firſt ſight ſa
<
lb
/>
tisfactory, is nevertheleſs inſufficient to give the total reaſon of
<
lb
/>
that notable abatement which hath been ſpoken of: But it is ne
<
lb
/>
ceſſary to have recourſe to our confideration of the velocity in
<
lb
/>
the courſe of the water, the chiefeſt and true cauſe of the vari
<
lb
/>
ation of the meaſure of the ſame Running-Water; for, that
<
lb
/>
multitudes of reeds, weeds, and plants diſperſed through the cur
<
lb
/>
rent of the Ditch, do chance notably to retard the courſe of the
<
lb
/>
water, and therefore the meaſure of the water increaſeth; and
<
lb
/>
thoſe impediments removed, the ſame water gaineth velocity,
<
lb
/>
and therefore decreaſeth in meaſure, and conſequently in
<
lb
/>
height.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>And perhaps this point well underſtood, may be of great
<
lb
/>
profit to the fields adjacent to the
<
emph
type
="
italics
"/>
Pontine
<
emph.end
type
="
italics
"/>
Fens, and I doubt not
<
lb
/>
but if the River
<
emph
type
="
italics
"/>
Ninfa,
<
emph.end
type
="
italics
"/>
and the other principal Brooks of thoſe
<
lb
/>
Territories were kept well cleanſed from weeds, their waters
<
lb
/>
would be at a lower level, and conſequently the drains of the
<
lb
/>
fields would run into them more readily; it being alwayes to be
<
lb
/>
held for undoubted, that the meaſure of the water before the
<
lb
/>
cleanſing, hath the ſame proportion to the meaſure after clean
<
lb
/>
ſing, that the velocity after the cleanſing hath to the velocity
<
lb
/>
before the cleanſing: An dbecauſe thoſe weeds being cleanſed </
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>