boiler plate not less than one-fourth inch in thickness, and not
less than three feet high, and shall provide an approved safety gate
at the top of each shaft, an adequate brake to control the drum used
for lowering or hoisting persons in shafts or slopes, and an
indicator on all machines used for such purpose, to show the
location of cages in shaft or slope. No cage having an unstable or
self-dumping platform shall be used for the carriage of persons
unless such platform is securely locked. (Sec. 916, 927; Penalty,
Sec. 976.)


Sec. 929. [=Hoisting and lowering of persons.=] The owner, lessee or
agent of a mine, at which the only means of ingress and egress for
the persons employed therein is by a vertical shaft or shafts, of
fifty feet or more in depth, shall designate one or more persons
whose duty shall be to attend to the lowering and hoisting of
persons into and out of such mine, and give and receive the proper
signals, governing the movement of the cage while engaged in
handling men. Not more than ten persons shall be lowered or hoisted
at any one time. The lowering of persons shall begin in time for
persons to reach their working places by hour appointed for mine to
commence work and continue until starting time. Hoisting of persons
shall commence at time for mine to cease work, and continue until
all have had time to be hoisted. Persons may be hoisted at such
other times as will not interfere with the hoisting of coal, or
other products. No person shall be lowered into or hoisted out of a
mine, with powder, explosives, tools or material on any cage, in the
same shaft, and no person shall be lowered or hoisted in a vertical
shaft in a mine car. When the vertical shaft is less than fifty feet
in depth, and a stairway approved by the district inspector of mines