THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 



269 



Mean Aie Movement — continued. 



Applying the correctioas for midnight dififerences and smoothing the results by con- 

 tinuous three-hour groups, we obtain the values shown in the plate, from which it will 

 be observed that in Spring and Summer the minimum wind velocity is recorded at 

 5 A.M. and the maximum at 2 p.m. , while in Winter the curve is reversed, the wind being 

 strongest at 3 a.m. and at a minimum at 5 and 6 p.m. On the mean of the ten months 

 there is a double period, with maxima at 2 a.m. and 1 p.m. and minima at 6 a.m. 

 and 7 p.m. The anemometer values for the Autumn season are not yet available, but, 

 taking the estimated wind force, it is evident that the curve approximates closely to that 

 of the Winter, with maxima about 6 a.m. and minima about 4 p.m. 



Showing the jSIean Hourly Velocity of tub Wixd at Scotia Bay. 



Note. — The means for June are deduced from 28 days' observations, July from 22 days, August from 



30 days, and February 1904 from 20 days. 



