. Transactions. menwere engaged in one part of the mine, as at Allerton Main, in addingair pipes to ventilate a heading through a fault. Later in the sameyear, viz., on December the sixth, a non-fatalexplosionof gas occurredat the Shirebrook CoUiery in Nottinghamshire, which was worked ex-clusively with locked (magnetic locks) double gauze bonneted lampsof the Wolf type (Fig. VII). And the following is the Inspector ofMines report on the occurrence :— I Safely Lamps and Colliery Explosions. 387 A night shift of workmen was sent to do some road repairs nearthe coal face, and near a fault. The p

. Transactions. menwere engaged in one part of the mine, as at Allerton Main, in addingair pipes to ventilate a heading through a fault. Later in the sameyear, viz., on December the sixth, a non-fatalexplosionof gas occurredat the Shirebrook CoUiery in Nottinghamshire, which was worked ex-clusively with locked (magnetic locks) double gauze bonneted lampsof the Wolf type (Fig. VII). And the following is the Inspector ofMines report on the occurrence :— I Safely Lamps and Colliery Explosions. 387 A night shift of workmen was sent to do some road repairs nearthe coal face, and near a fault. The p Stock Photo
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. Transactions. menwere engaged in one part of the mine, as at Allerton Main, in addingair pipes to ventilate a heading through a fault. Later in the sameyear, viz., on December the sixth, a non-fatalexplosionof gas occurredat the Shirebrook CoUiery in Nottinghamshire, which was worked ex-clusively with locked (magnetic locks) double gauze bonneted lampsof the Wolf type (Fig. VII). And the following is the Inspector ofMines report on the occurrence :— I Safely Lamps and Colliery Explosions. 387 A night shift of workmen was sent to do some road repairs nearthe coal face, and near a fault. The place to be repaired was a break-down of the roadway, leaving a high cavity in the roof. An official ofthe mine visited the place at about 11.15 p.m., and reported that hefound no gas, and the men continued at work until snap time.They had just resumed work when the gas was ignited. The injured person had taken his lamp and placed it upon a barabout 8 feet 6 inches from the ground, whilst he stood upon a tub to. Fig. VII —Wolf Lamp. Illuminant Henzolene. Showinj; .-irr.ini^ciucntfor lighting wiiliout opening the lamp. Magnetic locking. fi. some timber across the cavity above the bar. While doing thiswork an explosion of gas occurred and burned the man who was stand-ing upon the tub. The other man was uninjured, but a number of menran to the shaft in a panic. The explosion set fire to two bratticesheets and a wood pack, and so quickly did the fire extend that but 388 The Canadian Mining Institute. for the energy of the officials and the use of hand grenades the firewould probably have soon been out of control, and have become ex-ceedingly dangerous. After the extinction of the fire the firedamp again appeared, in-dicating that the fall of roof had liberated a small feeder from the fault.The lamp which was supposed to have fired the gas was carefully ex-amined, but no serious defect was found. This lamp was afterwards tested in an explosive mixture of gasand air without any f