190 3. 



Sunshine. — The amount of sunshine recorded at the Ben Nevis Observatory and at 

 the Fort- William Observatory by Campbell-Stokes Sunshine Eecorders has been 

 throughout measured in hourly periods. 



Up to 31st December 1902 these periods were reckoned from the beginning to 

 the end of each hour, and the amounts so computed are entered in the tables of this 

 and the preceding volumes of observations. 



From 1st January 1903 onwards, however, the amounts are measured from the 

 half-hour before to the half-hour after each hour, and are so entered in the tables for 

 1903 and 1904. Thus the amount entered under 3 o'clock is that recorded from 

 2 h 30 m to 3 h 30 m , and not as formerly that recorded during the hour ending at 

 3 o'clock. 



