AND OTHER WATER WAVES 109 



Curtis on " An Attempt to Determine the Velocity 

 Equivalents of Wind Forces Estimated by Beau- 

 fort's Scale" 



The third column gives what is usually called 

 the velocity of the wind, by which is meant its 

 average velocity. But the velocity of the wind 

 varies very rapidly. This is particularly noticeable 

 when the wind is strong. Every gale is gusty and 

 affected by squalls, and columns 4 and 5 sho.w 

 the average range of wind velocity, corresponding 

 to each of the numbers or degrees of the Beaufort 

 scale. 



