Safety lamp

Presented by The Royal Commission on Accidents in Mines.

This is of the Belgian standard pattern, but provided with additions brought out in 1883 by Mons. L. Somzée for fire triers ' use, consisting of a compound helix of steel and zinc soldered together placed in the space between the gauze and the chimney. When heated to the temperature given by the combustion of a predetermined percentage of gas, the expansion of the helix causes contact with a terminal, closing a circuit comprising a small wet cell and electric bell below the reservoir. A screw lock is fitted. In practice the lamp was found to be too easily deranged.

Presented by The Royal Commission on Accidents in Mines.

This is of the Belgian standard pattern, but provided with additions brought out in 1883 by Mons. L. Somzée for fire triers ' use, consisting of a compound helix of steel and zinc soldered together placed in the space between the gauze and the chimney. When heated to the temperature given by the combustion of a predetermined percentage of gas, the expansion of the helix causes contact with a terminal, closing a circuit comprising a small wet cell and electric bell below the reservoir. A screw lock is fitted. In practice the lamp was found to be too easily deranged.