PROCESS OF FRACTIONAL CONDENSATION. 



1 



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 temperature of which is regulated by means of a separate lamp, b, Fig. 2, 

 or by a safety-furnace, p, as shown in Fig. 1. The bath may be of oil or water, or of 

 metal for very high temperatures, as the case may require, and is furnish od with a 

 thermometer, t. 



Fig. 1. 



That this bath may be equally adapted for the separation of liquids boiling below 

 the common temperature, an empty vessel, c, Fig. 1 and 2, is permanently secured in 

 the interior of the bath by means of straps of metal across the top, to serve as a con- 

 venient receptacle for ice or iced water, by means of which a low temperature may be 

 steadily maintained. This interior vessel also serves a good purpose in economizing 



record of any one's ever having 



fire 



both 



and low temperatures, and for the most delicate work. 



proposed by Wurtz, is simply a modification 



process, 

 beinc? n< 



same, or, at most, but slightly better 



t rod 



ned being, that 



somewhat more quickly. 



• 



