Craig and Bidders. – This lamp was fastened with a spring lock, to be opened by means of a powerful magnet.

Deflector. – Amongst the numerous lamps recently designed to meet the requirements of the Mines Regulation Act, 1887, is the deflector (Fig. 364). In this lamp there are two gauzes, as in the Marsaut. The lower part of the gauze caps is surrounded with a brass ring, near the top of which are holes, through which air can enter the lamp. Above these holes a flange projects outwards towards the shield. The aircurrent enters through vertical holes in the brass ring covering the glass, as shown in the figure, is then deflected downwards by the flange above named, through the gauze on to the flame. The products of combustion escape through the upper part of the gauze, and through openings near the top of the shield.