THE SUBMARINE OF TO-DAY AND TO-MORROW. 205 



Table IV. 



Length 66' lo" 



Surface displacement, tons 35 



Submerged displacement, tons 43 



Engines Diesel 



Horse-power, surface 50 



Speed, surface, knots 8 



Radius, surface, knots 150 



Speed, submerged, knots 6 



Radius, submerged, knots 18 



Armament, torpedo tubes 2 



The conditions to be met in the defense of the limited coast lines of Holland 

 and Denmark have resulted in the adoption of units larger than the pure harbor 

 defense boat above described. The characteristics of the three designs employed 

 for this purpose in the Dutch and Danish navies are given in Table V below. 

 In connection therewith, it may be remarked in passing that vessels of these char- 

 acteristics might prove very useful to the navies of larger countries for local de- 

 fense purposes and that, therefore, their classification, whether as coast defense 

 vessels or as local defense vessels, would depend not upon the characteristics of the 

 boats themselves, but upon the duty assigned them. 



Table V. 



Design Design Design 



No. I No. 2 No. 3 



Length 98' 119' 116' 



Surface displacement, tons 132 165 187 



Submerged displacement, tons 149 204 229 



Horse-power, surface 300 450 350 



Speed, surface, knots 11 12 1 1.5 



Radius, surface, knots 1,000 1,000 750 



Speed, submerged, knots 8.5 8 8.5 



Corresponding radius, knots 25 24 25 



Armament, torpedo tubes 2 2 3 



Turning now to the countries with long coast lines or scattered possessions, we 

 find that, except where financial considerations are of very vital importance, the 

 defense of the coast is now entrusted to vessels with a surface displacement rang- 

 ing from 350 to 550 tons. The characteristics of some of the best known of such 

 types are given in Table VI. 



