THE STEAM ENGINE 341 



2. What is the H. P. of an engine that is capable of raising 

 3 tons of coal (2240 Ibs. to the ton) from a mine 289 ft. deep in 3 

 minutes? 



3. How many tons of coal can an 8 H. P. hoisting engine raise 

 in 34 sec. from the hold of a coal barge, a distance of 61 ft.? 



4. How long will it take a 10 H. P. hoisting engine to raise an 

 812-lb. ram of a pile-driver to a height of 23 ft.? 



5. How many pounds of water per half-minute can an 8 H. P. 

 pump raise to a height of 86 ft.? 



6. If 1 Ib. of coal gives off 15,337 B. T. U. of heat, find the 

 amount of work stored in 1 Ib. of coal. 



7. If 1 Ib of coal gives off 14,897 B. T. U. of heat, find the 

 amount of work stored in 1 Ib. of coal. 



8. If 1 Ib. of coal gives off 15,111 B. T. U. of heat, find the 

 amount of work stored in 1 Ib. of coal. 



