226 APPENDIX. 



expended per minute. Divide this by the volume from a cubic foot of water, and we get the 

 cubic feet of water required per minute. 



Example. Let the diameter of the cylinder be 30 inches, the velocity of the piston 120 feet 

 per minute, the temperature of the steam 250, and its elastic force 29 Ibs. on the 

 square inch. 



250 

 Add 459 



709 

 Multiply by 38 



5672 



2127 



Elastic force 29) 26942 (929 cubic feet of steam 

 261 from 1 cubic foot of 



water. 



58 



262 



Diameter 30 inches 

 30 



900 

 6 x 120 = 720 



Divide by 11) 6480|00 



589 cubic feet of steam per minute. 



929) 589-0 (0-634 cubic foot of water 



5574 required per minute. 



3160 



2787 



3730 



Some addition should be made to the result for clearance of the cylinder, escape through the 

 valves, and waste. 



The quantity of water required serves to determine the dimensions of the hot water pump. 



About 12 times the quantity is necessary for condensation. 



LOCOMOTIVE ENGINES. 



26. To find the effective force of gravity when an engine and train are running"upon an in- 

 clined plane. 



RULE. Multiply the gross load in tons by 2240 and divide the product by the length of 



