724 LAWS OF MARYLAND. [CH. 307

one but the mine foreman or fire boss or some one by them
especially authorized in an emergency may pass beyond such
station until such mine has been examined in every part as
hereinbefore required and reported safe. The fire boss shall
not permit any persons not authorized to enter into or
remain in any portion of such mine through which a dan-
gerous accumulation of gas is being passed into the ventilating
current from any portion of such mine, and shall report any
violation of this provision to the mine foreman. When the
station of the fire boss is located at a distance within the mine
in order to be convenient to portions being worked, the op-
erator shall wall off all abandoned workings, whether finished
or not, from the main intake and manway headings or passage-
ways of the mine by stoppings of masonry or concrete, suffi-
ciently heavy to keep explosive or noxious gases from entering
the intake air at any point between such fire bosses' station and
the entrance to such mine.

SEC. 135. Suitable record books shall be kept at the mine
office on the surface and at the fire bosses' permanent station,
in duplicate, to be accessible to the district mine inspector
and any employee of such mine. The fire boss shall enter
and sign in ink, a full daily report of each day's examination,
stating clearly the approximate amount of explosive or nox-
ious gases found and where found, and also state clearly the
nature and location of any danger that may have been dis-
covered in any place in such mine, and whether such danger
has been immediately reported to the mine foreman. The
mine foreman shall read and countersign such report each day.

SEC. 136. Any fire boss who neglects to make any of the
examinations hereinbefore required, or fails to report any
danger discovered or knowingly reports falsely upon any con-
dition within such mine, or fails or neglects to make the
reports required, shall be guilty of a misdemeanor.

SEC. 137. In any portion of a mine where an undue quan-
tity of dry dust or other waste material accumulates and may
tend to cause an explosion, and especially when explosive gas
is being generated in quantities sufficient to be observed with
an approved safety lamp, the operator shall, subject to regula-
tion of the Bureau, keep such dust, and the haulage ways and
working places containing the same, well moistened with
water often applied, or shall use other efficient, approved
means; and shall remove such dust from the mine at frequent
intervals.