and +5 deg.. Their temperature is shown by a
thermometer running into the boiler, F.
These vapors, purified by ebullition at a low temperature, rise into a
second rectifying column, G, which terminates in the refrigerator, H,
filled with liquid sulphurous anhydride. This refrigerator is like those
which we employ in our sulphurous anhydride frigorific apparatus. Under
the action of a special pump, M, this liquid produces and maintains a
constant temperature of -25 deg. to -30 deg. in the refrigerator. The
vapors of alcohol condense therein at this low temperature, and the cold
liquid alcohol flows into the lower part of the refrigerator.
By the action of a return cock, a portion of this liquid falls upon
the plates of the column, G, and descends, while the vapors are rising
therein. The other portion of the liquid obtained flows into the
reservoir, K, at the beginning of the operation, and into the reservoir,
L, during all the remainder of the rectification. The ice-making machine
keeps up of itself alone the two operations.
In fact, the exhaust of the steam engine which actuates the sulphurous
anhydride pump is directed into a worm which circulates through the
first boiler, A, and the refrigerator, H, of the frigorific machine
keeps up the second rectification, which was brought about below the
surrounding temperature, and which for this reason takes place without
necessitating any combustion of coal.
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