206 APPENDIX. 



Example. Take the same as before. 



Temperature 250 

 Add 51-3 



301-3 log. 2.47900 



Multiply by 5'13 



743700 

 247900 

 1239500 



12-7172700 

 10-94123 



Corresponding number 5 9- 7 1 '77604 



To be increased by 0*1 



Required force 59-8 inches of mercury. 

 This Rule appears to be preferable for high temperatures. 



The force in inches of mercury may be reduced to ffis. on the square inch by dividing 

 successively by 2, 6, and 9, and subtracting the third quotient from the first, thus : 



2) 59'8 inches of mercury, 



6) 29-9 



9) 4-98 



0-55 

 29-35 ffis. per square inch. 



2. To find the volume or space the steam of a cubic foot of water occupies, when the steam 

 is of a given elastic force and temperature, and separated from the liquid from which it is 

 generated. 



RULE. To the temperature, in degrees, add 459 and multiply the sum by 76-5 ; divide the 

 product by the force of the steam in inches of mercury, and the result will express the space 

 in cubic feet which the steam of a cubic foot of water will occupy. (84.) 



Example. Let the force be 4 atmospheres, or 120 inches of mercury, and the tem- 

 perature 295. 



Temperature 295 

 Add 459 



754 

 Multiply by 76-5 



3770 

 4524 



5278 



57681-0 



