288 Count Rumford's Experiments to determine 
sure of the atmosphere when its temperature is equal to that of 
boiling water, or to 212 0 of Fahrenheit's thermometer, and as 
its elasticity is doubled by every addition of temperature equal 
to 30 degrees of the same scale, with the heat of 212 0 -f- 30° 
= 242° its elasticity will be equal to the pressure of 2 atmo- 
spheres; at the temperature of 242° -f 30° = 272° it will equal 
4 atmospheres ; 
at 272 0 4- 30° = 302° it will equal 8 atmospheres ; 
at 302° -f 30° = 332 0 
16 
at 332 0 -f 30° = 362° 
32 
at 362° -f 30° — 392 0 
64 
at 392 0 -f 30° = 422® 
128 
at 422° -f 30 5 = 452 0 
256 
at 452 0 + 30° = 482° 
512 
at 482° -}- 30°= 512° 
1024 
at 512°+ 30° =542° 
2048 
at 542° -f 30° = 572° 
4096 
at 57 2 ° + 3°° = 602°, (or 2 degrees above the heat of boil- 
ing linseed oil,) its elasticity will be equal to the pressure of 
8192 atmospheres, 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 gene- 
rated 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 pres- 
sure of 8192 atmospheres. 
Following up our computations on the principles assumed, 
(and they are founded on the most incontrovertible experi- 
ments) we shall find that, 
