On the Dew Point. 



65 



III. Multiplying this number, by the weight of one hundred cubic 

 inches of steam, the weight of vapor in one hundred cubic inches is 

 found. 



IV. Dividing the mean barometric height, by the numbers denot- 

 ing the elasticity, the proportion of pressure due to the vapor is de- 

 termined. 



V. The numbers denoting the elasticity, multiplied by the specific 

 gravity of mercury ; the numbers obtained on the inches, and parts 

 in depth of water, which would resuh from a total condensation of 

 the whole vapor. Other interesting results are readily obtained from 

 these numbers. 



The following table exhibits the results, without the delay of arith- 

 metical processes ; the numbers expressing the elasticity of steam, 

 are from the table by Mr. Dalton ; his numbers being a mean be- 

 tween those of Mr. Daniell and Dr. Ure. 



Vol.. XVIII.— No. 1. 



