AND OTHER WATER WAVES 119 



3 p.m. February ist at Branksome Chine (about 

 W. 2) is about 48 hours. The westerly swell at 

 N. 45, W. 41, if starting at noon on January 3Oth, 

 would reach Branksome Chine at the required time 

 if it travelled at the speed of 1,960 -~ 48 = 40.8 

 statute miles per hour. Now the observed group- 

 velocity of the swells recorded at Branksome Chine 

 on February ist was 39.25 statute miles per hour. 

 There is, therefore, strong ground for regarding 

 that swell as being the result of the storm which 

 occurred two days before at a distance of nearly 

 2,000 statute miles. 



From Mr. F. J. Brodie's paper on " The 

 Prevalence of Gales on the Coasts of the British 

 Isles during the Years 1871-1900 " we learn that 

 in the great storm of December 22, 1894, the 

 wind had a velocity of not less than 53 statute 

 miles per hour for 14 hours (as observed, of course, 

 at a fixed station), 64 statute miles per hour for 

 9 hours, and 76 statute miles per hour for 2 hours. 

 On January 12, 1899, 53 statute miles per hour 

 was maintained for 6 hours and 70-76 for i hour. 

 The velocities attained in gusts are recorded in 

 another paper. 2 In January, 1899, a rate of 90 

 statute miles per hour was recorded at Southport 



* Q.y.R.M.S., 1902. 



2 Symonds, Met. Mag., May, 1900. 



