CHAPTER VI 



THE ENGINE PROPER 



THE term "traction engine" commonly includes, not 

 only what is strictly speaking, the engine, but the 

 boiler and traction parts as well. In this book, 

 the term "engine proper" will be used to designate those 

 parts which are actually concerned in converting the en- 

 ergy of steam into rotary motion. The boiler changes 



REVERSE LEVER 

 CLUTCH LE) 

 THROTTLE LEVI 



FIG. l8. SIDE ELEVATION OF ENGINE PROPER. 



water into steam by adding to it, heat, taken from the fuel. 

 The engine proper consumes steam and delivers motion. 



The Cylinder. It is in the cylinder that the actual 



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