. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. e recurved tube 6must be dipped as far under thesurface of the tarry liquid, as tobe in equilibrio with the pressureof the gas upon the water in thepurifier. The tube b is closed attop with a screw cap, which canbe taken off at pleasure, to per-mit the interior to be cleansed. Both by the overflow from thereceiver-pipe b, and by subse-quent condensation in the tube d, tar and ammoniacal liquor collect progressively in thecistern or pit under c, by which mingled liquids the lower ori
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. e recurved tube 6must be dipped as far under thesurface of the tarry liquid, as tobe in equilibrio with the pressureof the gas upon the water in thepurifier. The tube b is closed attop with a screw cap, which canbe taken off at pleasure, to per-mit the interior to be cleansed. Both by the overflow from thereceiver-pipe b, and by subse-quent condensation in the tube d, tar and ammoniacal liquor collect progressively in thecistern or pit under c, by which mingled liquids the lower orifice of the vertical tube/ isclosed, so that the gas cannot escape into the empty space of this cistern. These liquidsflow over the edges of the inner vessel when it is full, and may from time to time bedrawn off by the stopcock at the bottom of the cistern. Though the gas has, in its progress hitherto, deposited a good deal of its tarry andammoniacal vapors, yet, in consequence of its high temperature, it still retains a con-Biderable portion of them, which must be immediately abstracted, otherwise the tar. GAS-LIGHT. 55S would pollute the lime in the vessel e, and interfere with its purification. On this ac-count the gas should, at this period of the process, be cooled as much as possible, in orderto condense these vapors, and to favor the action of the lime in the purifier e, upon thesulphureted hydrogen, which is more energetic the lower the temperature of the coal gas passes, therefore, from the tube / into the tube h of the condenser d, whichis placed in an iron chest g filled with water, and it deposites more tar and ammoniacalliquor in the under part of the cistern at t, t. When these liquids have risen to a certainlevel, they overflow into the tar-pit, as shown in the figure, to be drawn oflf by the stop-cock as occasion may require. The refrigerated gas is now conducted into the purifier e, which is filled with milk oflime, made by mixing one part of slaked li
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