372 



PROCEEDINGS OP THE AMERICAN ACADEMY. 



Amagat's paper,* and in the translation by Barus in the book edited by 

 him entitled " The Laws of Gases," p. 55. A few modifications 

 deserve mention, — the change of piston areas, and the substitution of 



light engine oil in place of castor oil, and of a heavy cylinder oil in 

 place of molasses, this substitution being made according to a sugges- 

 tion of Professor Barus'. Figure 9 shows the manometer used in this 

 work. 



Amagat, Annales de Cliimie et de Physique, 6, 19 (1893). 



