574 



caknot's theory of the motive power of heat. 



Taule y>. VanoiUi Encfincx in lehlrh the Temperature of the Boilers is 121 ,* and 



that of the Condenser 30". 



Tlieurelkiil Dtiti/ fur each Unit of Heat Iranniiiitled, 'ill fvut-puundg. 



Work prnduLcd 

 for each pound 

 of coal con- 

 sumed. 



(3.) French Engines, according to contract, . 

 (4.) English Engines, according to contract, . 

 (6.) Common Engines, consimiing 12 Ihs. of coal 



per horse-power per hour, 

 (7.) Improved Engines with expansion cylinders, 



consuming an equivalent to 4 lbs. best coal 



per horse-power per hour, 



Foot-Pouuds. 



* « * 



.565,700 

 165,000 



495,000 



Work pvuduced 

 for each pound 

 of water eva- 

 porated. 



Foot-pounds. 



98,427 

 IM X 80,814 



l\i X 23,571 

 flj X 70,710 



Work produced 

 for each unit 

 of heat trans- 

 mi ttt'd. 



Per cent- 

 age of 

 theoreti- 

 cal duty. 



Poot-Pouiids. 



160-3 

 130-8 



381 



lU-4 



43-2 

 35 



10-3 

 30-7 



Pressure 15 lbs. on the square incli. 



