Avoirdupoise Weight reduced into 7 roy. 103
Ex. I. In 6835 pounds 6 ounces 9 pennyweights 6 graitts 7 roy t $u.
How much Avoirdupoise weight f (See page 101.)
Avoirdupoise.
lb.
oz.
drams.
s4ooo
3291
6
13.68
j 2000
1645
11
6.84
Poundsj 800
658
4
9.14
*■**
..L
0
16
7
5.02
1 10
8
3
10.51
i 5
4
i
13-25
oz. 6
6
9.32
pw. 9
7.90
gr. 6
.22
Answer.
5624
10
11.88
Ex. II. In 5624 pounds 10 ounces 12 drams Avoirdupoise , Qu. Howmuch Troy weight ? (See page 102.)
Troy.
lb.
oz.
pw.
g r -
Pounds
s 5 00 °
6076
4
13
8
avoird.
\ 600) 20
729
24
2
3
0
13
0
8
4
>. 4
IO
6
16
oz. 10
9
2
7
dr. 12
13
15-08
Answer. j 6835 6 9 6.08
LEGT. VI.
Of pneumatics.
T HIS science treats of the nature, weight, and preflure of theair, and the effects arising from it.
The air is that (hin transparent fluid.body in which we live and The proper-breathe. It encompaflses the whole earth to a confiderable height; and, ties of air ‘together with the clöuds and vapours that-float in it, is called the atmo-fphere. The air is justly reckoned among the number of fluids, beeaufeit has all the properstes by which a fluid is distinguiihed. For, it yields