Safety lamp, Cambrian, Davy type, use: gas testing, maker: Thomas and Williams, Aberdare, marking: makers name, 1901

This is a form of the "jack" Davy for fire-triers' use; the air is admitted through holes in the circumference of the ring below the glass cylinder and passes through the gauze case to the flame. When testing for firedamp, the glass can be held up by a spring clip.