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 1 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( i 153-181 (Submarines). 

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



Chap. 7. 

 Howden, Boys 1 Book of Steamships, McClure Co., New York 



City. 

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



Chap. 2 (Submarines). 

 Maule, Boys 1 Book of New Inventions, Grosset and Dunlap, 



New York City. Chap. 8 (Turbines). 



