[ 360 ] 
into a vibrating motion like a pendulum r^*;; and there* 
fore, if a6ted upon ’when in the afcent, the height which 
it afcends to will come out greater than the truth ; and 
lefs, if adted on in the defcent. 
The height of the column of water fuftained in the 
wind-gage being given, the force of the wind upon a 
foot fquare is ealily had bythe following table, and con- 
fequently on any known furface. 
TABLE 
Height of the 
Force of the wind on 
Common defignation of 
water in the 
the foot fquare in 
fuch a wind. 
wind-gage. 
avoirdupois pounds. 
12 inches 
62,5 
1 1 
57^293 
10 
52,083 
> moll violent hurricane. 
9 
46,875 
J 
8 
41,667 
very great ditto. 
7 
36,548 
great hurricane. 
6 
3 Ij 75 
hurricane. 
5 
26,041 
very great llorm,. 
4 
20.833 
great ditto. 
3 
13.625 
llorm. 
2 
10,416 
very high wind.. 
I 
5^208 
high wind,. 
O7 
2,604. 
brilk gale. 
? 52 I 
frefh breeze.. 
0^ 
,260 
pleafant wind. 
04^0 
,130 
a gentle wind. 
(aj neWTONI Priacip. Mathemat. lib, II. prop. xliv. theor. xxxv. 
EXAMPLE.- 
