ROUGH-AND-TUMBLE ENGINEEK 137 



Q. How would you find the horse power of such a 

 boik 



A. Multiply the circumference of furnace 



:s length, then multiply the circumference of one 

 tube by its total length, and this product by the num- 

 ber of tubes, also taking into account the surface in the 

 tube sheet, add these products together and divide by 144. 

 < you the number of square feet of heating 

 tee in the boiler by 14 or 15, which will 



give the horse power of the boiler. 

 Q. Why do you say 14 or 15? 



Because some claim that it requires 14 feet of 

 heating surface to the horsepower and oil To 



you my personal opinion I believe that any of the 

 standard engines today with good coal and properly han- 

 dled, will and are producing I horse power for as low 

 as every 10 feet of surface. But to be on the safe side 



to divide by 15 to get the horse power of 

 boiler, when good and bad fuel is considered. 



Q. How would you find the approximate weight of a 

 boiler by measurement? 



A. Find the number of square feet in surface of boiler 



and fire box, and as a sheet of boiler iron or steel one 



enth of an inch thick, and one foot square, weighs 



pounds, you should multiply the number of square 



feet by 2.52 and thi* product by the number of i6tht of 



