i!)in 



nn Radiotoleiirdphy. 



208 



al)C)iit two hours later they arc at their weakest. They then begin to 

 strengthen again, and reach a very high maximum at about the time 

 of sunset at (llace Bay. ■ 



They then gradually return to about normal strength, but 

 through the night they are very variable. Shortly before sunrise at 

 Clifden the signals commenc-e to strengthen steadily, and reach 

 another high maximum shortly after sunrise at Clifden. The received 



v*m»TiaN.si(i«iALJ» 

 m/iiivr, AfWL init 



> j S/v/ 



n i ' vA 





A — ^ 



'W^RIATION OP SIGNALS 

 AT CLIFDEN 



FROM MAY 1910 to APRIL 1911 

 CURVE FOR FIRST DAY OF 

 EACH MONTH BEING SHEWN 



DATE, 



Fig. 9. 



Fig. 10. 



energy then steadily decreases again until it reaches a very marked 

 minimum, a short time before sunrise at Glace Bay. After that the 

 signals gradually come back to normal day strength. 



It can be noticed that, although the shorter wave gives on the 

 average weaker signals, its maximum and minimum variations of 

 strength very sensibly exceed that of the longer waves. 



Fig. 9 shows the variations at Clifden during periods of twenty-four 



