Bulletin . lignite briquets are manufactured. The principalresult of their work was a study of the explosivecharacter of lignite dusts mixed with air. Their apparatus(fig. 9) consisted of an explosion tube (E) of 50 cubiccentimeters capacity, having two platinum wires sealed through its sideabout midway the length of the tube. These wires (i i) are about 3to 4 millimeters apart. The spark used as the source of ignition wasobtained from an induction coil operated by twostrong Bunsen elements. In one end of this tube(Jc2) is fitted a one-hole rubber stopper, throughwhich passes a glass tube ^ be
Bulletin . lignite briquets are manufactured. The principalresult of their work was a study of the explosivecharacter of lignite dusts mixed with air. Their apparatus(fig. 9) consisted of an explosion tube (E) of 50 cubiccentimeters capacity, having two platinum wires sealed through its sideabout midway the length of the tube. These wires (i i) are about 3to 4 millimeters apart. The spark used as the source of ignition wasobtained from an induction coil operated by twostrong Bunsen elements. In one end of this tube(Jc2) is fitted a one-hole rubber stopper, throughwhich passes a glass tube ^ bent downward at aright angle. The longer limb of this tube (m) isimmersed under water. A weighed quantity ofdust is placed against the stopcock H. A is a glass bottle of 600 cu-bic centimeters capac-ity; B, a bottle of 3liters capacity. C is areservoir of waterplaced at a height of above the levelof the water in B. Ineach of the experi-ments performed gram of the dust was used. Water from the. m Figure 9.—Coal-dust ignition apparatus of Holtzwart and Meyer. reservoir (C) is allowed to flow into B, compressing the air containedin B to a pressure equal to the difference in the level of the water in oDinglers Polytechnisches Journal, vol. 280, 1891, pp. 185 and 237. [NVEKTIGATION8 OF THE [ONITION I COAL M 81 the tWO \rsscls. The screw cock c |g Mien opened until the air on bained in A is compressed to a definite pressure indicated l>.\ the ma-nometer IK This pressure was varied in the course of study of eachsum pie. After the proper pressure was secured in A and the apparatusconnected up as indicated, the passage of the spark between theterminals i i is started. II is then quickly opened ;md closed andthe character of the explosion observed. The character of theplosion is indicated Bomewhal by the behavior of the water closingthe open end of m. Eight samples of dust were tested. The results of these experi-ments and the analyses of the dusts are given in the two
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
