Langen's Collector

“Langens arrangement is a somewhat similar combination, the cone being made into a bell with perforated top, the edges of the perforation being turned over inwards bb; the bell rests upon the cup aa, the turned over edge cc fitting into a water lute surrounding the central tube kkk, so that whilst the bell is lowered the furnace top is gastight or nearly so. By means of a pair of levers d, d and a counterpoise swung on a horizontal axle at r by means of a winch e, the bell can be raised so that the charge in the cup falls into the furnace, sliding down the inclined surface. Two safety valves x and fg are provided, the latter being ordinarily supported by the pressure of the gases, but falling by its own weight when the gas pressure is relieved by raising the bell, so as to close the top of the gas shaft, the turned-down edges of g fitting into the annular groove oo; h is a small manhole for the introduction of scrapers to clear out flue dust when required.” — The Encyclopedia Britannica, 1893

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