[=Measure and report of ventilation.=] He shall keep a careful watch over the ventilating apparatus and air-ways, and measure the ventilation at least once each week, at the inlet and outlet, and at or near the face of all entries; which measurement shall be noted on blanks furnished by the chief inspector of mines. On the first day of each month, he shall sign such blanks, properly filled with the actual measurements, and forward them to the chief inspector of mines. (Sec. 922, 923, 924, 952.) [=Record of boys employed.=] He shall keep a record of the boys under sixteen years of age employed by him, or by any other person, giving the name, age, place of birth, name and residence of parents, and character of employment. He shall require written evidence from the parent or guardian of each said minors, that the requirements of the school laws of this state have been complied with. (Sec. 912, 944.) (See Child Labor Law, Sec. 13002.) "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. [=Assistant mine-foreman.=] The duties of mine-foreman shall apply to assistant mine-foreman, when acting for the mine-foreman, or in discharging the duties thereof. (Sec. 952, 965; Penalty, Sec. 976.) Sec. 954. [=Relating to over-seer.=] The over-seer shall visit the working place of each inexperienced person engaged at mining or loading, at such intervals as provided for in this act, and instruct them as to their work and safety and assist them in caring for their safety. He shall instruct such persons not to handle or use any explosives except in his presence, until they have been employed in a mine not less than three months, and not then until he is satisfied that such persons are fully competent to handle and use same with safety. When, in his judgment, such persons require more frequent supervision than provided for in this act, he shall visit their working places as frequently as in his judgment the circumstances require. The foregoing shall not prohibit the mine-foreman from fulfilling the duties of overseer, so long as all the provisions of this act are complied with. (Sec. 965; Penalty, Sec. 976.) =RELATING TO THE STABLEMAN AND FIRE-BOSS.= Sec. 955. [=Duties of stableman.=] The stable man shall see that the provisions of this act relating to stables are carried out, and shall forbid persons not required by duty, to enter the stable or loiter in or about same, whether the stable be inside of the mine or on the surface. (Sec. 945, 960.)