Elements of chemistry : including the applications of the science in the arts . ospheres, in the lastmentioned gas, at the temperature of 45°. The liquefaction of several of thesegases has since been effected by the application of cold alone, without compression. The principle of Faradays condensing tube has been embodied in the machine ofThilorier for the liquefaction of carbonic acid gas. (Annales de Chimie, &c. 1835,lx. 427, 432). It consists (fig. 36) of two similar cylindrical vessels of wroughtiron, made exceedingly strong, of the capacity of about three-fourths of agallon, each of which
Elements of chemistry : including the applications of the science in the arts . ospheres, in the lastmentioned gas, at the temperature of 45°. The liquefaction of several of thesegases has since been effected by the application of cold alone, without compression. The principle of Faradays condensing tube has been embodied in the machine ofThilorier for the liquefaction of carbonic acid gas. (Annales de Chimie, &c. 1835,lx. 427, 432). It consists (fig. 36) of two similar cylindrical vessels of wroughtiron, made exceedingly strong, of the capacity of about three-fourths of agallon, each of which is provided with a peculiarly constructed stopcock, being aspherical plug of lead on a spindle which can be screwed down, by turning thehandle above, into a spherical cavity of brass-work, having at its base a tubularopening into the cylinder, which is thus closed. There is also a connecting tube ofcopper, the ends of which can be attached by screws to the discharging orifices ofthe stopcocks, so as to unite the two cylinders when necessary. The stopcock being Fig. 78 GASES. removed from one of the cylinders a, whicn is called the generator, a charge is in-troduced, consisting of two pounds of pulverulent bicarbonate of soda and threepounds of water at the temperature of 90°. After stirring these well together witha wooden rod, a quantity amounting to one pound three ounces of undiluted oil ofvitriol is added, the latter heing contained in a long cylindrical vessel of brass, suffi-ciently narrow to enter the generator, into which it is carefully let down by a hookwithout spilling. The stopcock being now applied to the mouth of the generator,and firmly screwed down upon it, with the intervention of a leaden washer, thegenerator is turned round upon its supporting pivots, so as completely to invert it;the brass measure within is thus canted over, and the acid which it contained mixedwith the solution of soda. The carbonic acid of the salt, which amounts to half itsweight,
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