. Journal. s, as described in Eng. ,508 of 1914 (this J., 1915, 999), are arrangedin series, and lotated on a common shaft. Thefirst drum of the series discharges into the openah and draws air fi-om a casing which surroundsthe second drum of the series, and so on to thelast drum which draws air from the space in whicha vacuum is to be produced.—W, H. C. Furnaces fed with lyulverulent fuel. K. H. V. von Porat. Stocksund, and iMotala Verk,stads Nya Aktiebolag, Jlotala Verkstad, Sweden. Eng. Pat. ie,29S, Nov. 18, 1915, Powdered fuel is blown through the pipe, 60, and nazzle, 61, steam is in
. Journal. s, as described in Eng. ,508 of 1914 (this J., 1915, 999), are arrangedin series, and lotated on a common shaft. Thefirst drum of the series discharges into the openah and draws air fi-om a casing which surroundsthe second drum of the series, and so on to thelast drum which draws air from the space in whicha vacuum is to be produced.—W, H. C. Furnaces fed with lyulverulent fuel. K. H. V. von Porat. Stocksund, and iMotala Verk,stads Nya Aktiebolag, Jlotala Verkstad, Sweden. Eng. Pat. ie,29S, Nov. 18, 1915, Powdered fuel is blown through the pipe, 60, and nazzle, 61, steam is injected through the pipe, liSj Cl. I.—GENERAL; PLANT; MACHINERY. [ncj. 20. 1918. 02. and air is injured thixnigh the pipe. •• Thefuel jet is deflecte<i by the walls of the chamber. 59,foruiini; a loop, to the outlet. ( A grate. 69,for stolid fs thnaiLrh ii curwd channel, 66,. to the combustion chamber, 08. Before the useof powdered fuel is commenced, firing by means ofsoUd or liquid fuel on the grate. 71, may he the fuel may be injected into a lateralchamber before passing into the mixing chamber,59, to prevent pre-ignition. A deflecting screenmay be arranged at the entrance to the mixingchamber or a deflector may divide the mixtureinto two parts.—W. F. F. Shafl-furnaces and kilns. K. Thiele. Hoxter-an-der-Weser. Germany. Eng. Pat. May30, 1916. (Appl. Xo. 7602 of 1910.) TffE kiln is provided with two grates, situatedside by side, which receive a horizontal recipro-cating motion by means of shafts passing air-tight thKUgh packing boxes anci connected bypitmans with cranks set at an angle of 180° toeach f>ther on opposite sides of the driving grates are formed with a central grid portionhaving bars set at an oblique angle to the directionof motion, and end plate portions having teeth andperforations, and are so ar
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