[=Must not obstruct airway.=] No person shall place refuse in, or
obstruct any airway or breakthrough used as an airway.


[=Injuries to mine by workmen and others.=] No workman, or other
person, shall knowingly injure a water gauge, barometer, air-course,
brattice, equipment, machinery, or live stock; obstruct or throw
open an airway; handle or disturb any part of the machinery of the
hoisting engine of a mine; open a door of a mine and neglect to
close it; endanger the mine or those working therein; disobey an
order given in pursuance of law, or do a wilful act whereby the
lives and health of persons working therein, or the security of a
mine, or the machinery connected therewith may be endangered.
(Penalty, Sec. 976.)


Sec. 961. [=Persons not permitted to ride on haulage trips.=] No
person or persons except those in charge of trips, superintendents,
mine-foremen, electricians, machinists and blacksmiths, when
required by their duty, shall ride on haulage trips, except where by
mutual agreement in writing, between the owner, lessee or agent, and
the employes, a special trip of empty cars is run for the purpose of
taking employes into and out of the mine, or empty cars are attached
to loaded trips, which shall not be run at a speed exceeding eight
miles per hour. No person except a trip rider shall ride on loaded
car or cars, and he shall ride only the front or rear end of the
trip. (Sec. 958.)


[=Size of lamps for open lights.=] No person, except as hereinafter