be moved at a speed greater than four miles per hour.  When rope haulage is used, an enclosed light shall be carried on the front end of each train so hauled.  When a mechanical haulage trip passes through an automatic door having no attendant other than persons in charge of such trip, the trip-rider shall be required to ride the rear car of the trip while passing though such door, and see that it closes after the trip passes through. (Sec. 923, 958; Penalty, Sec. 976.)

Sec. 944. [=Employment of minors.=] The owner, lessee or agent of a mine shall not employ, or permit to work therein, any boy under fourteen years of age; nor employ, or permit to work therein, any boy under fifteen years of age during a term of the public schools, in the district in which he resides. (Sec. 912, 953.) (See Child Labor Law, Sec. 13002, page ——­).

“The provisions of Section 912, 944 and 953 G.C. do not permit the employment of children under 16 years of age in, about or in connection with any mine.  Such employment is governed by the provisions of Section 13002 G.C.”

    Opinion No. 885 office of the Attorney General, State of
    Ohio, December 21, 1917.

[=Removal of combustible matter.=] Whenever an entry or air-way becomes so dry that the air becomes charged with dust, the owner, lessee or agent shall cause such entry or air-way to be sprinkled, and all accumulated matter, explosive in its nature, shall be removed from the mine. (Sec. 956.)

[=Quantity of oil in mine restricted.=] No oil shall be taken into or stored in a mine except as may be required to be opened for use within two days thereafter; and in no case shall more than two barrels of oil be kept at any one place, and not more than ten barrels of oil shall be had in a mine at any one time.  All waste oil and empty barrels shall be promptly removed from the mine. (Sec. 974, 975.)

[=Location of boilers at mine.=] The permanent boilers used for generating steam, and the buildings containing the boilers, shall not be nearer than sixty feet to any mine opening or to a building or inflammable structure connected with or surrounding such opening.  (Penalty, Sec. 976.)

Sec. 945. [=Relating to underground stables.=] The owner, lessee or agent of a coal mine at which the live stock is kept underground, shall observe the following:  The stable or stall shall be separated from the main inlet and main outlet air-courses by not less than twenty feet of solid strata or a solid wall of brick or masonry not less than twelve inches in thickness, except at two doors not more than five feet wide, which shall be made of steel plate not less than one-quarter inch in thickness and hinged to the solid strata or masonry without the use of wood; the ventilation for the stable shall be taken from main inlet air-course by a by-pass or separate split and returned to the main outlet air-course so that the air passing the stables will not enter the inward