Table 1. Hourly values of sea-surface 

 Values are thermogram readings 



June 9-18; at Hamburg June 22-July 7; at Reykjavik July 20-27. d Gradual fall of 2f3 between OOh and 17h; 

 leaving Helgoland. ® Sharp fall and rise of 2° between 04h and 08h. Another sudden fall and rise of lf5 

 between 14h and 17h; squalls during day. f Small, rapid fluctuations between llh and 24h; partly cloudy 



172 



