THE STEAMBOAT 299 



7. What features are found on the submarine that are not 

 found on the ordinary boat ? 



REFERENCES 



Cressey, Discoveries and Inventions of the Twentieth Century, 



E. P. Button Co., New York City. Chap. 15 and pages 328- 



333 (Submarines). 

 Darrow, The Boys' Own Book of Great Inventions, Macmillan Co., 



New York City. Chapter 10 (Submarines). 

 Doubleday, Stories of Inventors, Doubleday Page and Co., 



New York City. Pages 85-97 an d 153-181 (Submarines). 

 Holland, Historic Inventions, G. W. Jacobs Co., Philadelphia. 



Chap. 7. 

 Howden, Boys' Book of Steamships, McClure Co., New York 



City. 

 Johnson, Modern Inventions, F. A. Stokes Co., New York City. 



Chap. 2 (Submarines). 

 Maule, Boys' Book of New Inventions, Grosset and Dunlap, 



New York City. Chap. 8 (Turbines). 



