. Transactions. ing glass pariraised and the bonnet removed. demonstration may be shown by the failure of a double gauze Ilarsautlamp. The inventor of this type of lamp, in his book on safety lamps,states that he obtained one failure out of every nine tests with similarlamps when they were suddenly surrounded with an explosive mixtureof firedamp and air. At the Wishaw colliery, Scotland, in 1895, anunbonneled Mueseler which was being used to test by a fireman for fire- 384 The Canadian Mining Institute. damp in a narrow heading partly ventilated by the exhaust from an engineworked by compresse
. Transactions. ing glass pariraised and the bonnet removed. demonstration may be shown by the failure of a double gauze Ilarsautlamp. The inventor of this type of lamp, in his book on safety lamps,states that he obtained one failure out of every nine tests with similarlamps when they were suddenly surrounded with an explosive mixtureof firedamp and air. At the Wishaw colliery, Scotland, in 1895, anunbonneled Mueseler which was being used to test by a fireman for fire- 384 The Canadian Mining Institute. damp in a narrow heading partly ventilated by the exhaust from an engineworked by compressed air, suddenly passed the flame through bothgauzes without the lapse of any appreciable interval, and immediatelyexploded the accumulated firedamp. Several miners who were presentand saw what occurred were waiting to go into the heading to fetchout their tools, but no one was killed. Passing on to the modern type of Clanny, viz., the one known asthe bonneted Clanny, we find that at the Allerton Main colliery in. Fig. IV.—Clanny Lamps. Yorkshire in 1894, whilst several men were engaged in placing, andalso replacing some air pipes which were used to ventilate a headingthrough a fault, an explosion was originated by the failure of abonneted Clanny lamp to withstand a mixture of air, firedamp, anddust, moving at a low velocity. These lamps were afterwards sub-mitted to Prof. Lupton, of Leeds, who tested them in high velocities s Safety Lamps and Colliery Explosions. 385 of mixtures of firedamp and air, but without coal-dust, and failed tomake them explode the outer atmosphere. Another notable failure of a bonneted Clanny occurred at theShakerley Colliery, Lancashire, in 1895, where a y^arty of officials wereengaged in trying to move an accumulation of gas by clearing an air-way. All the lamps had been extinguished excepting one, and theman who was using it was practically in a quiescent atmosphere, butthe heading being old and very dusty, undoubtedly dust, disturbed bythe moveme
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