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 lieigiit, 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 result from a total condensation of 

 tlie 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. 



Dew 



Point. 



5 



10 

 15 

 20 

 25 

 30 

 35 

 36 

 37 

 38 



39 

 40 

 41 



42 

 43 



44 

 45 



46 



47 

 48 



Elasti- 

 city. 



.066 

 .076 

 .090 

 .108 

 .129 

 .156 

 .186 

 .221 

 .229 

 .237 

 .245 

 .254 

 .263 

 .273 

 .283 



.294 

 .305 

 .316 

 .328 

 .339 

 .351 



Vol- 

 ume, 



'^22' 

 .25 

 .30 

 .36 

 .43 

 .52 

 .62 



.74 



.76 



.79 



.82 



.85 



.88 



.91 



.94 



.98 



1.02 



1.05 



1.09 



1.13 



1.17 



Weight. 



.42 



.47 



.57 



.68 



.81 



.99 



1.18 



1.41 



1.44 



1.51 



1-56 



1.61 



1.67 



1.73 



1.79 



1.86 

 1.94 

 2.01 

 2.07 

 2.15 

 2.23 



Water. 



.894 

 1.03 

 1.21 

 1.46 



1.74 

 2.11 



2.42 

 2.99 

 3.10 

 3.21 

 3.32 

 3.44 

 3.56 

 3.69 

 3.83 

 3.98 

 4.13 

 4.28 

 4.44 

 4.59 

 4.75 





Dew 



Point. 



49 

 50 



51 



52 



Elasti- 

 city. 



.363 

 .375 

 .388 

 .401 

 53 !.415 



54 



55 

 56 

 57 

 58 

 59 

 60 

 61 

 62 

 63 



64 

 65 

 66 

 67 

 68 

 69 

 70 



.429 

 .443 

 .458 

 .474 

 .490 

 .507 



Vol- 

 ume 



1.21 



Weiojht. i Water.i 



1.29 

 1.33 

 1.38 

 1.43 

 1.47 



1.52 



1.58 

 1.63 

 1.69 



.524 1.75 



.542 

 .560 



.578 

 .597 

 .616 

 .635 

 .655 

 .676 

 .698 

 .721 



1.80 

 1.87 

 1.92 

 1.99 

 2.05 



2.11 



2.18 



2.25 



2.32 

 2.40 



2.30 



1.25 2.38 



2.45 

 2.53 

 2.61 

 2.72 15.79 



4.91 

 5,08 

 5.25 

 5.43 

 5.61 



2.80 



2.89 

 3.00 

 3.10 

 3.21 

 3.33 

 3.44 

 3.56 

 3.67 

 3.79 

 3.90 

 4.02 

 4.15 

 4.28 

 4.42 

 4.57 



I 





6.00 

 6.20 

 6.41 

 6.63 

 6.85 

 7.10 

 7.34 

 7.58 

 7.83 

 8.08 

 8.35 

 8.60 



8.88 

 9.16 

 9.47 



9.77 



Vol. XVIll.— No. 1, 







