AND OTHER WATER WAVES 31 



Coniston Water are only formed when, after about 

 three days of steady wind blowing along the length 

 of the lake has produced a steady " run " of waves, 

 it comes on to blow very hard in the same direction. 

 Under such circumstances he recorded, near the 

 upper end, a wave-length of 65 feet and a height of 

 5 feet. These measurements were made against the 

 side of the steam gondola. He relies upon the length 

 to less than 5 feet either way i.e., is sure that the 

 waves were more than 60 and less than 70 feet 

 long. The determination of height he found more 

 difficult. The wave-length attained under these 

 somewhat rare conditions was 1-5 69th of the length 

 of the whole series. The length of wave was 13 

 times the height. Assuming the same steepness of 

 water for ordinary gales as for the above unusual 

 storms, the height of wave corresponding to the 

 wave-length of 46 feet would be 3^ feet, and this, 

 I suppose, is seldom much exceeded on Coniston 

 Water. 



The Lake of Geneva 



On Lake Leman, or the Lake of Geneva, Dr. 

 F. A. Forel records during storms wave-periods 

 of 4.7 seconds at Morges and 5.0 at the town of 

 Geneva. The longest run which a wave could 

 have before reaching Morges is 27 statute miles, 



