After the gas leaves the retort it passes through a hydraulic main which not only acts as a valve to prevent the gas escaping but also removes a portion of the tarry matter.
From the hydraulic main the gas is drawn into the condensers where the temperature is reduced to that of the atmosphere and all tar and aqueous vapour previously held in suspension is deposited. The quantity of tar produced during a year amounts to about 450,000 gallons.
The gas is draw from the retort: by rotary exhaus: ers which also push the gas through all the punti d into the gas holders.
scrubbers are used for relieving de gas of its ammonia, and the hydrogen extracted in purifiers which are charged with hydrated ferrie oxide, the sesqui oxide being converted to sesqui sulphide which on revivification takes up oxygen from the air and deposits the sulphur in the free state. "The purified gas measured in the station meter before passing into the gas holders The car buretted water gas two sets, each having ity of 800.000 cubic feet per da The process Revost Hovse Suowrsa Coat of manufacture follows:—Coke is taken up a and tipped into the generators.—A\ under pressure is then passed thro the bed of fuel, and after two minutes the coke' is raised incandescent temperature. The Dlast hen shut off and steam ted into the coke for a period of five minutes. The steam becom decomposed—the oxygen combining with the carbon to form carbon-monoxide, while hydrogen is given off in the free state. The mixture which is called water gas then passes into the carburetter, in which chamber liquid fuel is vaporized. The oil vapour and water gas are permanently combined by subjecting the mixture to intense heat in a superheater, The engine room is pact and contains the hydraufor working the lifts, pumps ing the oil-into the carburetter, pumps for feeding the boilers and scrubbers, exhausters for drawing the gases irom the generators, also the fans driven by De Laval steam turbi Water gas tar is used as fuel for the boilers. From the generator house the carburetted water gas passes through condensers, scrubbers and _purificrs similar to those used in the manufacture of coal gas.
Text read from the printed page and cleaned; old type leaves the occasional error.