Popular Science Monthly 



175 



practical operation a n d 

 care and preservation of 

 these complicated engines 

 keeps the recruit busy dur- 

 ing the week. 



For the fifth week, the 

 subject is that of internal 

 combustion engines. The 

 study of the principles of 

 these engines, and of 

 special types such as the 

 Hornsby-Akroyd, M e i t z 

 and Weiss oil engines, is 



The navy offers an opportunity to study 

 electrical engineering 



thoroughly pursued, and the practical 

 operation, care and preservation of all 

 oil engines is taught. 



In the sixth week, the theory of mag- 

 netism and electricity is studied, and in 

 the seventh week, the instructors teach 

 the students the theory of the dynamo 



Bluejackets in artillery and infantry 

 exercises ashore. Above, a school- 

 room on shipboard 



and electro-magnetism. 



Practical work on dynamos is ac- 

 complished during the next two 

 weeks, and pupils learn the mys- 

 teries of turbo-generators, switch- 

 boards, operating dynamos in par- 

 allel, care of the plant and dynamo 

 room routine. 



Theoretical and practical work on 

 motors occupy the recruits' time 

 from the tenth to the twelfth week. 

 Studies are made of the principles of di- 

 rect current motors, motor generators 

 and dynamos, and practical work is done 

 on service motors and motor starting 

 and controlling devices. Ammunition 

 conveyors and hoists, gim elevating 



