Bulletin . FURNACE FOR SOFTENING-POINT DETERMINATIONS. 75 pipe, threaded into a lj-inch iron pipe serving as an observationtube, which in turn is threaded into the center of the front end vertical i-inch iron pipe with a brass stopcock threaded into J s-i , eu ieei 01 ixu. d. ot o. gage uiciirume wir I /Transit* ( ^ Asbestos paper Thermometer well : ?> ,----•—?--- ??»»??*»?«< i III! KZti 11 80 feet of No. 20 B. & S. gage nichrome wire Hydrogeni/ilet. Figure —Vertical longitudinal section through molybdenum furnace No. 3. the top of the observation tube serves as a by-

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Bulletin . FURNACE FOR SOFTENING-POINT DETERMINATIONS. 75 pipe, threaded into a lj-inch iron pipe serving as an observationtube, which in turn is threaded into the center of the front end vertical i-inch iron pipe with a brass stopcock threaded into J s-i , eu ieei 01 ixu. d. ot o. gage uiciirume wir I /Transit* ( ^ Asbestos paper Thermometer well : ?> ,----•—?--- ??»»??*»?«< i III! KZti 11 80 feet of No. 20 B. & S. gage nichrome wire Hydrogeni/ilet. Figure —Vertical longitudinal section through molybdenum furnace No. 3. the top of the observation tube serves as a by-pass around thesaturator for admitting pure hydrogen to the furnace. The free endof the observation tube carries a brass sleeve into which is threaded 76 FUSIBILITY OF COAL ASH. a brass cap bearing on an asbestos gasket, as shown in figure cap is fitted with a glass window, through which the temperatureis read optically. The glass is held between two asbestos gaskets by _, Hydrogen•> I. inlet

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou