182 



Miscellanies. 



enabled to measure the tension of steam, within these limits, by its 

 action on a mass of air* The following table shows the results, 

 which have been extended to 24 atmospheres by experiments, and 

 it was carried up to 50 by interpolation, by means of the formula 



e 



( 



1 the pressure of the atmosphere. This formula represents, with 

 sufficient exactness, all the results furnished by experiment, as far as 

 24 atmospheres ; the confidence which the committee of the Acade- 

 my placed in it is such that they are convinced that at 50 atmos- 

 pheres, the error could not amount to more than 0.1. 



Table of the elastic force of steam at temperatures corresponding 



with 1 to 50 atmospheres. 



Elasticity, 



atm. press. 



being 1. 



Temperature, 

 Centigrade. 



| Elasticity, 

 atm. press, 



i 



100. 



1_ - - - - - 112.2 



2 

 3 



121.4 



128.8 

 135.1 



3£ 140.6 



4 



145.4 



4£ 149.G 



5 



153.8 



H - - - - - 156.8 



6 



7 



8 



160.2 



163.48 



166.5 



169.37 



172.1 



9 177.1 



10 



11 

 12 



181.6 



196.03 



120. 





Temperature 

 Centigrade. 



being 1. 



13 ----- - 193.7 



14 197.19 



15 200.48 



16 203.60 



17 206.57 



18 209.4 



______ 212.1 



o 



19 



20 214.7 



21 

 22 

 23 

 24 



217. 



219.6 



221.9 



224.2 



25 226.3 



30 236.2 



35 - - - - - - 244.85 



40 252.55 



45 259.02 



50 260.89 



Jdem. 



MM 



Note on the fabrication of steel at Shejji 



By cementation. — Steel of cemen- 

 tation (blister steel,) is made at Sheffield of Swedish iron, by a pro- 

 cess which has been often described, and relative to which, we shall 



