Suction gas plants . Fio. 51.—Riche, 1902. secondary supply of air A. They then pass on through the cokein the second chamber, where they are rediiced. APPENDICES. 189 The second class, of which Rowes, Sutherlands, and Bellsproducers are examples, have no secondary supply of air, or the. Fio. 52.—Rowe, 1903. air supply is so reduced that decomposition only of the tar cantake place. In the Rowo producer the outer chamber containsthe bituminous coal, while the central retort contains coke. The

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