eel eta he 
C. M. Warren on a Process of Fractional Condensation. 331 
_ In the new process, perfect control of the temperature of the 
vapors is secured by simply conducting these vapors upward 
through a worm contained in a bath, aa, figs. 1 and 2, the tem- 
ture of which is regulated by means of a separate lamp, 6, 
g.2, or by a safety-furnace, p, as shown in fig. 1. The bat 
» may be of oil or water, or of metal for very high temperatures, 
_ asthe case may require, and is furnished with a thermometer, ¢ 
be 
. 
‘That this bath may be equally adapted for the separation of 
i low t , : 
ee auent receptacle for ice or iced water, 
_ OW temperature may be steadily main 
terior vessel are both made of sheet-copper, with joie 
