Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . ixed a pipe, which descends nearly to thebottom of the reservoir. At the sumnjit of the pipeis a screw, which admits the attachment of a ]iunip,by whicli the liquid in the reservoir is removed. Gas-pipe Tongs. A wrench for screwing pipesinto or out of their coupling. See Pipe-toxgs. Gas-pressure Regu-lator. See Gas-jiegu- LATUU. Gas-puri-fier. An appaiatus in wh
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . ixed a pipe, which descends nearly to thebottom of the reservoir. At the sumnjit of the pipeis a screw, which admits the attachment of a ]iunip,by whicli the liquid in the reservoir is removed. Gas-pipe Tongs. A wrench for screwing pipesinto or out of their coupling. See Pipe-toxgs. Gas-pressure Regu-lator. See Gas-jiegu- LATUU. Gas-puri-fier. An appaiatus in which gas ispurified of its sulphur comjionnds. The purification of gas by passing it through lime-water is the invention ofJIr. Clegg, England, andwas introduced in 1S07. The ordinary illuminating gas, after having beenevolved in the retort, its tar eliminated in the emi-denser, and its ammonia alistracted in the washer, ispassed through the purifier, whose duty is to removethe sulphur and remler the gas fit for consumption. The wet-lime purifier has several chambers con-taining a certain depth of cream of lime. The gaspasses through each chamber in succession, bubblingup through the liquid, the contact being rendered Fig. Wet-Lime Purijier. more intimate by arms which rotate in the spacesthrough which the gas in flowing from onechamber to another. The arms also stir up the limeand prevent its settling. The cream of lime absorbs the sulphureted hy-drogen and carbonic acid, tlie water absorbs theremaining ammonia. This process has been generall) abandoned on ac-count of the difficulty of disposing of the foul creamof lime known as blue billy. In the dnj-lime process slightly moist hydrate oflime is placed on trays, or iron boxes, throughwhich the gas is made to pass. This process is veryeffective, and has very generally .su]ierseded the wet-lime process. It removes the sulphur compoundsand the carbonic acid equally well. AVhen the foullime is removed, however, it e
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