Prof. Regnault on the Specific Heat of some Simple Bodies. 115 



This specific heat is much lower than that which I found for 

 metal prepared with the oxalate, and the product of the specific 

 heat by the atomic weight 350 is 35*33. I think that the 

 metal contained some foreign body. 



M. Dumas placed at my disposal another quantity of cobalt 

 which he considered to be pure. One portion of it consisted 

 of small bars; the other formed three almost spherical bullets. 

 The metal was malleable enough to be flattened in the cold by 

 the hammer, and the file readily cut it ; but the small ingots 

 grasped in a vice were broken when struck transversely by a 

 hammer. 



The metal in bullets gave the following results : — 



M 



225& r -17 



225^-17 



225^17 



225^-17 



P 



1^-5015 



18"5015 



1^-5015 



ls r -5015 



T 



97°-90 



97°'90 



97°*35 



97°-45 



& 



8°-39 



9°-57 



10°-56 



10°-44 



a& 



5°*3267 



5°'3034 



5°-2338 



5°-2920 



A 



422^-30 



422^-30 



422^-30 



422? r -30 



c 



0-10494 



0-10593 



0-10653 



0-10740 



Mean 



0-10620. 



The product by the atomic weight 350 is 37' 17. 

 The cobalt in bars cave — 



M . . 



. . 164^-65 



164^-65 



P • • 



. . 1^-5015 



l? r -5015 



T . . 



. . 97°'55 



97 3 -45 



& . . 



. . 8°-14 



8°-08 



A& . . 



. . 4°-0732 



4°-0127 



A . . 



. . 422^-30 



422s r -30 



C . . 



. . 0-10772 



0-10682 



Mean 



0-10727 



This specific heat scarcely differs from that found above. 



The following are the numbers which I have successively ob- 

 tained for the specific heats of cobalt and of nickel, excluding 

 some numbers which refer to metals evidently impure : — 







Cobalt. 



Nickel. 



n 1843 . . 



. . 01070 



0-1086 



1859 . . 



. . 0-1062 



0-1075 



1859 . . 



. . 0-1073 



0-1108 



The specific heat of cobalt is hence in all cases a little less than 

 that of nickel ; and it might be concluded that the atomic weight 

 of cobalt should be higher than that of nickel. The recent ex- 

 periments of M. Dumas have given the same atomic weights for 

 these two metals. M. Schneider, who has made some new 



12 



