182 



Miscellanies. 



Temperature, 

 Centigrade. 

 - 100. 

 112.2 



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= (14-0.7153^)5, in which e is the elasticity, t the temperature, and 

 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. 



1 - - - 



u 



2 121.4 



2J - - - - - 128.8 



3 ----- - 135.1 



3^ 140.6 



4 145.4 



4J 149.6 



5 ----- - 153.8 



5J 156.8 



6 160.2 



6J 163.48 



7 166.5 



7J 169.37 



8 172.1 



9 177.1 



10 181.6 



11 196.03 



12 120. 



Elasticity, 



atm. press. Temperature, 



being 1. Centigrade. 



13 193.7 



14 197.19 



15 200.48 



16 203.60 



17 206.57 



18 209.4 



19 212.1 



20 214.7 



21 217.2 



22 219.6 



23 - 221.9 



24 ----- 224.2 



25 226.3 



30 236.2 



35 ----- - 244.85 



40 252.55 



45 259.02 



50 260.89 



Idem. 



3. JVote on the fabrication of steel at Sheffield in Yorkshire ; by 

 MM. CosTE and Perdonnet. — 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 



