164 



Experiments to determine 



temperature of 242°-]- 30°=:: 272° it will equal 4 atmos- 

 pheres; 



o o o _ _ 



at 272 -|- 30 = 302 it will equal 8 atmospheres; 



" 302 -|- 30 == 332 



" 33^ + 30 = 362 



" 362 4- 30 = 392 



" 392 + 30 = 422 



" 422 -f 30 = 452 



" 452 + 30 = 4S2 



" 4-S2 + 30 = 512 



" 512 -f 30 = 542 



" 542 + 30 = 572 



" 572 + 30 = 602 



(or 2 degrees above the heat of boiling linseed oil), its 

 elasticity will be equal to the pressure of 8192 atmos- 

 pheres, or above eight times greater than the utmost force 

 of the fluid generated in the combustion of gunpowder, 

 according to Mr. Robins's computation. But the heat 

 generated in the combustion of gunpowder is much 

 greater than that of 602° of Fahrenheit's thermometer, 

 consequently the elasticity of the steam generated from 

 the water contained in the powder must of necessity be 

 much greater than the pressure of 8192 atmospheres. 



Following up our computations on the principles as- 

 sumed, we shall find that, 



at the temperature of ^ the elasticity will be equal to the pressure of 



00 o ^ 



602 -|- 30 = 632 ) 16,384 atmospheres ; 



at 632 -j- 30 = 662 32,768 



at 662 -}- 30 = 692 65,536 " 



and at 692 -[- 30 := 722 



the elasticity will be equal to the pressure of 131,072 

 atmospheres, which is 130 times greater than the elastic 

 force assigned by Mr. Robins to the fluid generated in 



