[ l6 5j 
Table VI. containing the velocity and force of 
wind y according to their common appellations . 
Velocity of 
the Wind. 
<D C 
U co 
£ si 
Miles in one 
Hour. 
Feet in one 
fecond. 
Perpendicular 
on one foot aj 
pounds averdu 
Common appellations of the force of winds. 
1 
2 
3 
4 
5 
10 
15 
20 
25 
3 ° 
35 
40 
45 
50 
60 
80 
100 
i ,4 7 
2,93 
4,40 
5,87 
7,33 
14.67 
22.00 
29.34 
36.67 
44 .01 
5 1 .34 
58.68 
66.01 
73.35 
88.02 
117,36 
146,70 
,005 
,020 
,044 
,079 
,123 
,492 
1,107 
1,968 
3,075 
4,429 
6,027 
7,873 
9,963 
12,300 
1 7,7 J 5 
3 M 9 ° 
49,200 
Hardly perceptible. 
^ Juft perceptible. 
| Gentle pleafant wind. 
j- Pleafant brifk gale. 
| Very brifk. 
| High winds. 
1 Very high. 
A ftorm or tempeft. 
A great ftorm. 
An hurricane. 
An hurircane that tears up trees, carries 
hiiildinas hefore it. Ar. 
1 
2 
3 
VII. concerning the ahfolute ejfe5l> produced by a 
given velocity of the windy upon fails of a given 
magnitude and conjlrutdion. 
It has been obferved by practitioners, that in mills 
with Dutch fails in the common polition, that when 
they make about 13 turns in a minute, they then 
work 
