500 



DIURNAL VARIATION OF WIND VELOCITY. 



For the diurnal variation in wind force we have to rely chiefly upon the pressure-tube anemometer 

 records, and, owing to their incompleteness for certain months, they have been grouped for the different 

 seasons instead of months in order to obtain mean values. 



The results of this grouping are given in Table XII., and they are also shown graphically in figs. 4, 5, 6, 

 where the seasonal curves are shown for each year, and also for the two years combined, after the values 



have been smoothed by the formula - . 



o 12345 67 8 9 10 n N. I 3 4 5 6 7 8 Q Id 



E e 



5 



10 



8 9 



8 



19 



17 



1902-3 



7 



& 1903- 



1902, -3 



1903-4 



t Comdinea, 



Smooched 



Mean Summer Tempera/Cure 



at Winter Quarters. 



Fig. 4. Diurnal variation of wind velocity. 

 Summer. 



01 234 5, 6 7 89 10 ii N. I a 3 4 5 67 8 9 IP II M. 



V'\g. 5. Diurnal variation of wind velocity. 

 Winter. 



