in the supply tank:  No gasoline, naphtha or kerosene shall be taken into the mine except in metallic cans, with a screw cap opening at the top, fitted with a suitable gasket:  No package or can, or the supply tank of an engine, containing gasoline, naphtha or kerosene, shall be opened until ready to make the transfer from the package or can to the supply tank, and in transferring, a funnel shall be used so as to avoid spilling the gasoline, naphtha or kerosene, and the cap on the supply tank shall be immediately closed:  In no case shall the package, can, or the supply tank, be opened, with any open light or other thing containing fire within twenty-five feet of same. (Penalty, Sec. 976.)

Sec. 947. [=Relating to use of electricity in mines.=] The owner, lessee or agent of a mine in which electricity is used as a means of power, shall observe the following in the application thereof: 

[=Trolley wires.=] All trolley wires shall be carried at least six inches outside of and parallel with the track rail on the side the trolley wire is located.  When regular height is less than six feet six inches from top of rail, the lower side of trolley wire must not exceed six inches from the roof or cross-timber with hangers now in use, with hangers not to exceed twenty-five feet between centers, and the tension sufficient to keep all wires from sagging and to prevent trolley wheel from coming in contact with roof or cross-timbers.  All new hangers hereafter installed shall not exceed five inches in depth from lower side of the trolley wire to the roof or cross-timbers.

[=Wires crossing traveling ways.=] All trolley and positive feed wires crossing places where persons or animals are required to travel, shall be safely guarded or protected from such persons or animals coming in contact therewith.

[=Wires opposite rooms and refuge holes.=] All trolley and positive feed wires shall be placed on opposite side of track from refuge holes or necks of rooms.

[=Bare wires; when not to extend into working places.=] No trolley wire shall be extended into or maintained in any room while being used as a working place; no trolley or feed wire shall be extended into any entry beyond the outside corner of the last breakthrough.

[=Switches and circuit-breakers.=] Switches or circuit-breakers shall be provided to control the current at the mine, and at all important points in the mine.

[=Machine feed wires and insulators.=] All machine feed wires shall be placed as near the rib and roof or cross-timbers as practicable; the positive wire to be carried not to exceed three inches from the rib and roof or cross-timbers, measured at the insulators, which shall be so placed as to keep the wire at least six inches outside of the track rail on the side the wire is located.  Insulators shall be placed not exceeding fifty feet apart, and all wires shall be carried so that same will be not less than six inches