8 9
Hydroßatical Talks.
6 Inches diameter.
6~ Inches diameter.
Ti
n>
Solidity
Weight 1
In avoir-
rt>
Solidity
Weight
In avoir-
in eubic
in troy
dupoiie
s
in eubie
in troy
dupoiie
er
qjT
inches.
ounces.
ounces.
tr
CXQ*
er
inches.
ounces
ounces.
i
339-3
179.0
196.6
I
398.2
210.1
230.7
2
678.6
358.1
393-3
2
797-4
420.3
461.4
3
1017.9
537-2
589.9
3
1195.6
630.4
692.1
4
i357- 2
7x6.2
786.5
4
1593-8
840.6
922.8
5
j 696.5
895-3
983.1
5
199 x, 9
1050.8
1153-6
6
2035.7
1074.3
1179.8
6
2390.1
1260.9
1384.3
7
2375-0
1253.4
1376-4
7
2788.3
1471-1
1615.0
8
27 1 4 * 3
1432 4
1573-0
8
3186.5
1681.2
1845.7
9
3053.6
1611.5
1769.6
9
3584.7
1891.3
2076.4
IO
3392.9
1790.6
1966.3
10
3982.9
2lOl-5
2307.1
20
6785.8
358 i.i
3932.5
20
7965.8
4202.9
4614.3
3°
10178.8
537 l -7
5898.8
30
11948.8
6304.4
6921.4
40
13571.7
7162.2
7865.1
40
i593l-7
8405.9
9228.6
5°
16964.6
8952.8
9831.4
50
19914.6
10507.4
11535-7
60
20357.5
10743-3
11 797.6
60
23897.6
12608.9
13842.9
70
23750.5
12 533-9
13763.9
70
27880.5
14710.4
16150.0
80
2 7‘43-4
14324-4
15730.2
80
31863.4
168 1 1.8
18457-2
90
30536.3
16x15.0
17696.5
9°
35846.3
18913.3
20764.3
100
33929.2
17905.6
19662.7
100
39829.3
21014.8
23071.5
200
67858.4
35811.2
39325-4
200
79658.6
42029.6
46143-0
6. Whenever a vacuum, is made in any vessel, the air by its weightwill endeavour to rush into the vessel, or to drive in any other bodythat will give way to its pressure ; as may be easily seen by a commonsyringe. For, if you stop the bottom of a syringe, and then draw upthe piston, if it be so tight as to drive out all the air before it, andleave a vacuum within the syringe, the piston being let go will bedriven down with a great force.
7- The force with which the piston is drove down, when there is avacuum under it, will be as the square of the diameter of the bore inthe syringe. That is to say, it will be driven down with four timesas much force in a iyringe of a two-inch bore, as in a syringe of oneinch : for the areas of circles are always as the squares of their dia-meters.
N
8. The