ON A 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, 8, 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 furnished with a 
thermometer, ¢. 
Fig. 1. 
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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 employed the oil bath and a separate fire to regulate a heated condenser, this 
being the essential feature on which the superiority of my process is based ; adapting it at once to both high 
and low temperatures, and for the most delicate work. 
The employment of bulbs, above referred to, as proposed by Wurtz, is simply a modification of the old 
process. The bulb apparatus furnishes the same, or, at most, but slightly better results than a simple retort ; 
being no more than equivalent to increasing the height of the sides of the retort itself, without introducing any 
control over the accuracy of the results; the only advantage gained being, that these results are obtained 
somewhat more quickly. 
