Safety lamp

Safety lamp, Evan Thomas no.7, Clanny type, from the Royal Commission on Accidents in Mines, maker: E. Thomas, Aberdare, 1885' with opening tool (see 2 stroke numbers).

Presented by The Royal Commission on Accidents in Mines.

This bonneted Clanny lamp embodies improvements, patented in 1885 by Mr. Evan Thomas, which consisted in fitting the bottom of the gauze with a brass collar having a horizontal flange extending to within 0.06 in. of the bonnet; through this annular space the air for combustion passes. The waste products, after passing the capped gauze, have to pass a baffle inside the top of the bonnet. The illuminating power is 0.4 to 0.5 candles. A screw lock is fitted to the reservoir, and a pillar lock to the bonnet, which is forced up when the reservoir is screwed on.

The lamp was one of four most favourably reported on by the Commissioners, whose experiments proved it to be safe, even in an inclined position, in explosive mixtures of velocities up to 3,200 ft. per min.; the flame was scarcely affected by violent oscillations or rapid motion vertically.