Manchester Memoirs, Vol. xlvii. (1903), No. IIJ. 5 



A = semi-amplitude of the wave surface, a maximum 

 when equal to draught or freeboard. 



w 



B = mean beam = 



dw 



From this it is evident that the stress may become 

 large in either of two ways, either 

 (a) ^y reason of the term 



becoming small, and ultimately zero, giving for a critical 



velocity 



2 7r [oEI 6-28 I^El 



