90 



THE ROYAL SOCIETY OF CANADA 

 Table V — Continued 



P = Highest gust velocity in the hour. 



A = Number of times the velocity was recorded. 



The mean gust velocity is the weighted mean velocity. 



To correct for errors in estimating velocities the results were 

 smoothed by taking the mean of three successive velocities as the 

 velocity for the middle reading. The results were then corrected to 

 actual wind velocities according to the factor given in Fig. 2. The 

 results are given in Table VI, and the corrected results are plotted 

 in Fig. 4. The most probable value for this curve as deduced by the 

 method of Least Squares is 



Vg = 2-8 + l-26 Vmor Vg=3 + l-26 Vm 



where Vg is the probable gust velocity and Vm is the mean velocity 

 during the hour. Simpson^ deduced the equation 



Vg=l-5 + l-3 Vm 



for this value. For practical purposes these two equations are identical 

 and the results here simply confirm those obtained by Simpson (loo. 

 cit.) that the gustiness of the wind is linearly proportional to velocity. 



