Paragraph 6

It shall be the duty of the manager of every mine to make and ensure the efficient carrying out of arrangements to secure the maintenance of the lighting performance of safety-lamps used in the mine, being lamps of a type the approval for which specifies the lighting performance thereof, and in particular so that if an inspector selects from lamps of such types returned to the lamp room after use on any shift and not upon examination in pursuance of paragraph (3) of regulation two found to be damaged a sample comprising not less than fifty lamps or one half of the number of lamps returned after that shift (whichever is the less) and after external cleansing determines the mean spherical candle-power of any cap lamps and the maximum horizontal candle-power of other lamps in that sample it shall in the case of at least half of those lamps be not less than sixty per cent. of the performance specified in the relevant approval, or, if another percentage (not exceeding seventy-five per cent.) is specified in an order made by the Minister, that other percentage thereof.