of Winds requijite to move heavy Wind Machines. 497 
^ I |2 vr- J A . r ’ r • • ' ' " .% f , 
> Days. 
degree and upwards in') 
> 4.283 
Winds of the fecond 
each week, 
Calms and winds below the fecond degree, 
Winds of the third degree and upwards, 
Calms and winds below the third degree, 
Winds of a mean proportion between the two 
preceding degrees, — ■ — 
Calms and winds below the mean degree, 
) 
2.717 
0.902 
6.098 
2.592 
4.408 
The proportion of thefe winds in the year comes out 
in weeks and fractional parts thus : 
Weeks. 
Winds of the fecond degree and upwards in 
the year, ■ — • — ■ — 
Calms and winds below the fecond degree, 
Winds of the third degree and upwards, 
Calms and winds below the third degree, 
Winds of a mean proportion between the two 
preceding, — — — 
Calms and winds below the mean, — 
3i-9°3 
20.239 
6.719 
45-4 2 3 
19.307 
2.83 
From this computation we have 2.592 days in a week, 
or 19,307 weeks in a year, in which wind machines of 
Vol. LXVII. T t t 
the 
