employed therein. When there is but one shaft available for ingress
and egress from any unavoidable cause, the appliances therein shall
be kept available to persons therein employed at all times. When
such appliances in any shaft are rendered unavailable from any
cause, the same shall be restored without delay.


[=Emergency appliances.=] When the only means of egress is by
vertical shaft, in which cages or elevators are used as a means of
hoisting persons therein employed, and the power for operating same
is derived from but one source, the owner, lessee or agent shall
provide and keep on hand for use in the event of an accident to the
hoisting apparatus or the power by which same is operated, a
suitable windlass, capable of hoisting the persons from the mine.


[=Competent engineers.=] The owner, lessee or agent of a mine worked
by a shaft or slope, shall put in charge of an engine used for
lowering into or hoisting out of such mine persons employed therein,
only experienced, competent and sober engineers. (Sec. 916, 928;
Penalty, Sec. 976.)


Sec. 928. [=Metal speaking tube and safety appliances.=] The owner,
lessee or agent of a mine operated by shaft, shall provide and
maintain a metal tube suitable for conversation between persons,
connecting the engine room with the top and bottom of such shaft; an
approved safety catch, a sufficient cover, and rings or other
adequate handholds for ten persons, on all cages used for lowering
and hoisting persons: Such cages to be protected on each side by a