Safety lamp

Safety devices were increasingly employed to prevent accidents arising from careless or improper use of safety lamps in mines, one of the most frequent temptations being for the miner to relight his own lamp in the working place. This lamp was brought out about 1852 by Mr. Mackworth, one of H.M. Inspectors of Mines. It is similar to Glover's, except that the air has to pass through the outer gauze case before reaching the annular space, the bottom gauze of which is of conical form. On this rests the internal glass which, being of small diameter, acts as a chimney; its orifice is contracted by a brass cone. A reflector is placed between the glasses. The lead lock was also the invention of Mr. Mackworth; a lead rivet is placed in lugs projecting from the sides of the oil vessel and of the case, and clinched by the pair of pincers shown, having a device on one jaw so that the rivet cannot be tampered with without detection.

Safety devices were increasingly employed to prevent accidents arising from careless or improper use of safety lamps in mines, one of the most frequent temptations being for the miner to relight his own lamp in the working place. This lamp was brought out about 1852 by Mr. Mackworth, one of H.M. Inspectors of Mines. It is similar to Glover's, except that the air has to pass through the outer gauze case before reaching the annular space, the bottom gauze of which is of conical form. On this rests the internal glass which, being of small diameter, acts as a chimney; its orifice is contracted by a brass cone. A reflector is placed between the glasses. The lead lock was also the invention of Mr. Mackworth; a lead rivet is placed in lugs projecting from the sides of the oil vessel and of the case, and clinched by the pair of pincers shown, having a device on one jaw so that the rivet cannot be tampered with without detection.