781. Safety-lamps and lighting at coal, etc mines.

781.     Safety-lamps and lighting at coal, etc mines.

At mines of coal, stratified ironstone, shale or fireclay, the manager of a mine in which or in part of which the use of permitted lights1 only is lawful must make, and ensure the efficient carrying out of, arrangements for the examination before and after use of all safety-lamps and firedamp detectors2 so that no such lamp or detector is taken below ground unless it has been thoroughly examined and found to be in safe working order and is securely locked3. In a safety-lamp mine4 every safety-lamp being taken