61 
Steam Engine, 
After repeated experiments by all these methods, and 
a careful comparison of the results, I was enabled to di- 
gest the following table of the force of steam from water 
in all the temperatures from 32° to 212°. 
Two important enquiries still remained, the first to de- 
termine the force of steam from water above 212° and be- 
low 32 ; the second, to determine the comparative forces 
of vapour from other liquids. These enquiries seemed in- 
dependent of each other ; notwithstanding which I found 
them in reality connected. 
Upon examination of the numbers in the table, within 
the limits just mentioned, there appears something like a 
geometrical progression in the forces of vapour ; the ratio, 
however, instead of being constant, is a gradually dimi- 
nishing one : thus the 
Force at 32° == ,200 inch. 
17. 50 ) 
122 == 3. 500 ( Ratios. 
8. 57) 
212 = 30. 000 
If we divide these ratios, according to observation, diey 
will stand thus : 
Force at 32° == ,200 inch. 
4. 550“ 
77 = ,910 
3. 846 
122 == 3. 500 
3. 214 
167 =11.250 
2. 666 J 
212 = 30.000 
If we divide these again they become. 
Ratios. 
