11. The cause was assumed to have been the ignition of firedamp by a safety lamp . 12. Such towers and the conductors they carry must be equipped with flight safety lamps and reflectors. 13. It was a type of safety lamp used in mining, but was not invented until 1815. 14. The committee secured the services of Sir Humphry Davy, inventor of the safety lamp , in 1815. 15. Safety lamps had been ordered for the mine and a barometer had been provided to Hodge.16. In January 1879 safety lamps had been ordered. 17. Sir Humphry Davy was asked to consider the problems of a safety lamp following the Felling explosion. 18. Improvements made to Calumet Mine in 1910 were : 230 Wolfe safety lamps and equipment were renewed. 19. Both of these practices were strictly forbidden; they clearly negated the whole point of the safety lamp . 20. Subsequently, Clanny incorporated aspects of both lamps and produced the ancestor of all modern oil safety lamps .
