ROl MBLE ENGINEER I2</ 



would tend to prevent it passing the 

 center. 



Q. \\ c stroke of an engine? 



A It :> the :: tuncc the piston travels in the cyl- 



ter. 



Q. How do you find the speed of a piston per min- 

 ute? 



A. Double the stroke and multiply it by the num- 

 ber of revolutions a minute. Thus an engine with a 

 .ch stroke would tr : inches, or 2 feet, at a 



revolution. If it made 200 revolutions a minute, the 

 1 be 400 feet a minute. 



Q. What is considered a horse power as applied to 

 an engine. 



A. It is power sufficient to lift 33,000 pounds one 

 foot high in one minute. 



Q. What is the indicated horse power of an en- 



A. It is the actual work done by the steam in the 

 cylinder as shown by an indicator. 

 Q. What is the actual horse power:* 



It is the power actually given off by the driv- 

 ing belt and pulley. 



Q. How would you find the horse power of an en- 

 gine? 



Multiply the area of the piston by the average 

 pressure, less 5 ; multiply this product by the number of 



