working places of the mine, and arranged so that the by-pass or split can readily be closed at both inlet and outlet sides of the stable by steel doors hinged to the solid strata or masonry without the use of wood; the construction of the stable inside shall be free from pine or light lumber; shall be of brick or masonry as much as practicable, and any timber used shall be of hardwood of a cross section not less than three by six inches; no hay or straw shall be taken into the mine or stable unless same be compressed into compact bales, and then only from time to time in such quantities as will be required for two days’ use; no greater quantity of hay or straw shall be stored in the mine or stable, and when such is taken into the mine it shall be taken inside the stable at once; the lights used in the stable shall be incandescent electric lamps, placed so that same will not be injured by the stock or by persons required to enter the stable, or lanterns of railroad type suitable for using lard or signal oil, and only such oil shall be used therein; all refuse and waste shall be promptly removed from the stable and the mine, and shall not be allowed to accumulate.  Stables constructed underground after the passage and approval of this act, shall be located not nearer than one hundred and fifty feet of any opening to the mine used as a means of ingress or egress. (Sec. 955, 960; Penalty, Sec. 976.)

Sec. 946. [=Relating to use of gasoline in mines.=] No gasoline, naphtha or kerosene engine shall be used in a mine, except for operating pumping machinery where electric, compressed air or steam power is not available or cannot be transmitted to the pump, and then the owner, lessee or agent shall observe the following:  Notice shall be made to the chief inspector of mines before installing, and the installation and operation shall be subject to his approval:  No wood or inflammable material shall be permitted nearer than twenty-five feet of the engine:  The supply tank from which the gasoline, naphtha or kerosene is fed to the engine, shall be of metal, with a suitable screw cap opening, fitted with a gasket, so as to make the tank air-tight and prevent the escape of gas into the atmosphere, and the tank kept free from leaks:  the gasoline, naphtha or kerosene shall be fed from a tank to the carburetor or mixer by metal tubes securely connected so as to reduce the possibility of leaks to a minimum:  The exhaust from the engine shall be conducted by means of metal pipes into the return air current, so that the fumes of combustion will not enter the workings of the mine where the men are required to work, or be conducted in an upcast shaft or slope not used as a means of ingress or egress, or through metal pipes to the surface:  At no time shall there be more than five gallons of gasoline, naphtha or kerosene in the supply tank; at no time shall more than five gallons of same be taken into the mine at any one time, and at no time shall there be more than ten gallons in the mine, including that