Popular Science Monthly 



85 



Channel and the North Sea, and while their 

 sea-keeping qualities are excellent, never- 

 theless they do not carry enough food and 

 fuel to last more than ten days. On the 

 other hand, however, a boat of this size 

 painted gray is invisible at a distance of 

 more than three miles, so that it is often 

 possible to catch the submersible unawares. 

 The boats are intended for offensive opera- 

 tions almost entirely, though of course they 

 would make good convoys near the coast. 



The British have discovered that fighting 

 the submarines is a question first of all of 

 endurance. A larger chaser would be more 

 comfortable, of course, but by no means so 

 dangerous to the submarine. 



covered eight miles. End to end they would 

 form a chain nearly twenty-five miles long 



for England were motor-boats in the 

 ordinary sense. They were really yachts. 

 The interior design from bow to stern was 

 as follows: 



Chain locker, lavatory for crew 

 forecastle for eight men, am- 

 munition room, large fuel 

 tanks, engine room, gal- 

 ley, mess room, office 

 state room for two 

 and additional tank 

 capacity in the ex- 

 treme rear. On 

 deck there was a 

 platform forward for 

 a three-inch gun. 

 Behind this was the 

 chart house, and 

 further back still the 

 bridge where the 

 steering apparatus 

 and engine telegraph 

 were located. 



One feature of this 

 boat is an arrange- 

 ment by which the 

 steering lines are laid 

 along the side of the 

 deck from the wheel, 

 making them easily 

 accessible for repairs. 



The chasers were 

 designed for service 

 in the English 



The buoyancy of 

 you from sinking 



A Board Which Will Help You 

 Learn to Swim 



A SWIMMING board invented by 

 William H. Roberts, of Newburyport, 

 Massachusetts, is a help in learning how to 

 swim. 



The device is nothing more than two 

 warp-proof boards of pine which are 

 fastened together at a very large angle. 

 The swimmer straddles these at the narrow 

 junction of the boards. Lying with his 

 body flat upon the front board and 

 resting more or less upon the 

 saddle board, he is buoyed 

 up in the natural position 

 for swimming. He 

 learns the leg strokes 

 first and then the 

 arm strokes, and he 

 rests back upon the 

 boards whenever he 

 becomes tired. By 

 keeping his legs 

 going slightly, the 

 board is kept from 

 overturning. 



The buoyancy of 

 the boards helps 

 him to ride the 

 waves and contrib- 

 utes to his enjoy- 

 ment. Since there 

 is no danger to fear, 

 confidence is soon 

 gained and the 

 swimming strokes 

 are mastered in 

 short order. The 

 swimming board 

 the boards prevents » used purely for 



below shoulder level Sport, also. 



