COMPARISON OF PL ATI MM AND <;AS THK!;\I< >MI. I 1 .1 87 



Initial pressure = 793 '563 millinis. 

 Coefficient a = 0'003 672 27, 



which is the menu of the lust group of determinations given on p. 84. 



XXXVIII. COMPARISONS AT TEMPERATURES BETWEEN 250 AND 460'. 



For the comparisons at high temperatures we constructed ;i sjHscial heating bath, 

 which has proved satisfactory up to the temperatures indicated, and has sut>sequently 

 l)een employed up to about 600. 



This apparatus is represented in fig. 11). It consists essentially of a bath of a 



Fig. 10. 



i l"i- lliiili Ti'ini-rlnri' 



F, cast-iron tank holding the mixed niti.itc.s ; A, stirrer shaft ; C, chimney ; T, wall of 

 . iiir-liath cut away to show interior. 



