130 Transactions of the Royal Canadian Institute 



vessels of moderate speed — moderate in proportion to their length — 

 we find, broadly speaking, it is desirable to make the ends fine (that is to 

 say thin in ordinary language), and the waterlines rather hollow if 

 anything. Such vessels may often advantageously be made relatively 

 broad of beam in order to gain a large midship section, the displace- 

 ment being concentrated amidships and taken from the ends. For 

 very high speed vessels, however, such as destroyers, curiously enough, 

 the ends can advantageously be made quite fult*and blunt, it being de- 

 sirable in this case to make the area of the midship section much smaller 

 than in the case of vessels of moderate speed. The fact that the most 

 desirable features of form vary so with size and speed of vessel is alone 

 sufficient to require careful investigation of each important case by 

 Froude'slaw, and as a matter of fact no country which builds ships of any 

 iniportance is now without at least one experimental tank following the 

 principles discovered by the modest scientist who, fifty years ago, built 

 the first such establishment in his garden at Torquay, England. 



