length, caps, and other timbers necessary to securely prop the roof
thereof. When he examines a working place, he shall observe the
condition of the roof and timbering, and instruct the workmen
therein as to the proper method of timbering for the security of
the roof. He shall give such instructions to drivers, motormen,
trip-riders, and other persons, as may be necessary to keep a supply
of timber in each working place. (Sec. 933, 956.)


[=Miner without props or timber.=] When he finds a miner in a
working place without the necessary props, caps or timbers to
securely prop the roof thereof, he shall order such miner to leave
such working place until the required timber is supplied, which he
shall attend to promptly, and shall order that no cars be delivered
to such miner, until timber is supplied. (Sec. 933, 956.)


[=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,