Bulletin . erecorded on a chronograph. The connecting wires enter the galleryat regular intervals through iron tubes fixed under the roof, as shown in figure 15. The circuit isbroken at the point markedx through the explosion of afulminating cap. Measurement of tempera-ture.—For measuring thetemperature of explosion athermocouple and a LeChatelier galvanometer havebeen used, but for veryviolent and rapid explo-sions they are not satis-factory. Talcing samples.—The contrivance used at Lievin for taking sam-ples of the combustion gases is a simplified adaptation of the moreelaborate instrument a
Bulletin . erecorded on a chronograph. The connecting wires enter the galleryat regular intervals through iron tubes fixed under the roof, as shown in figure 15. The circuit isbroken at the point markedx through the explosion of afulminating cap. Measurement of tempera-ture.—For measuring thetemperature of explosion athermocouple and a LeChatelier galvanometer havebeen used, but for veryviolent and rapid explo-sions they are not satis-factory. Talcing samples.—The contrivance used at Lievin for taking sam-ples of the combustion gases is a simplified adaptation of the moreelaborate instrument at Altofts, and consists of an evacuated glassretort ending in a long-drawn closed bent tube at the end of which adetonator is fixed. The flame fires the detonator and the gases rushinto the glass vessel. By filing an indention into the glass tube at asuitable distance above the detonator the tube is made to break atthat point and the entrance of fulminate combustion gases is thussupposed to be Figure 15. -Device for breaking circuit in explosion galleryat Lievin. INVBSTIGA1 ions at BUBOFBJJ rATIONS. 155 RESULTS AT ALTOFTS AND LIEVINEXPERIMENTS WITH PROTECTION ZONES vi LIEVIN. The following is a synopsis of results obtained at the Lilvin gallery wiili zones of protection against coal dust: The gallery was divided into (lure /ones, a, l>, and o, 75, LOO, and60 meters long, respectively. To lest the effect of a Watered /one of eoiil dnsl, /one ;i . lined with line Lievin eonl dnsi, containing .JO per cent volatilematter; b with watered coal dust (2 liters per meter); and c with coarse coal dnsl. The result was slow propagation of the flame,visible 60 meters outside of the gallery. In a second test a contained coal dust as before; b was dustLbut watered as before; and c contained eoal dust as before. Theflame stopped midway of zone b. To test the effect of stone dust, in a was placed 450 grains of eoaldust per cubic meter, in b 450 grams per cubic meter of pure st
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
