ing when fire-damp is generating.=] He shall not fire a blast
in any working place which is likely to generate sudden volumes of
fire-damp, or where locked safety lamps are used, except with the
consent of the mine-foreman, or other competent person designated by
the mine-foreman for that purpose. (Sec. 962.)

[=Blasting when restricted to specific times.=] At a mine where the
firing of shots is restricted to specific times, no miner shall fire
a shot until the time appointed for him to do so, and then only in
such rotation as designated. (Sec. 962.)

[=Examination after blasting.=] After each blast, he shall exercise
great care in examining the roof and coal, and shall secure them
safely before beginning to load coal. (Sec. 962.)

[=Shall post after undermining.=] After the coal is undermined, he
shall, before shooting the coal, properly post the roof of his
working place.

[=Must not go under draw-slate.=] When draw-slate is over the coal,
he shall not go underneath the draw-slate until it is made safe
from falling, by securely posting it, and he shall not remove the
posts until the coal is removed and he is ready to take down the
draw-slate.

[=Shall load fine coal.=] He shall not place in the gob or refuse
pile, or cover up, any fine coal or coal dust, but shall load same
into cars. (Sec. 944; Penalty, Sec. 976.)

Sec. 957. [=Duties of machine men.=] Machine runners and helpers
shall use care while operating mining machines. They shall not
operate a machine unless the shields are in place, and shall warn
persons not engaged in the operating of a machine of the danger in
going near the machine while it is in operation, and shall not
permit such persons to remain near the machine while it is in
operation. They shall examine the roof of the working place and see
that it is safe before starting to operate the machine. They shall
not move the machine while the cutter chain is in motion. When
connecting the power cable to the electric wires, they shall make
the negative or grounded connections before connecting to the
positive, and when disconnecting the power cable, shall disconnect
from the positive line before disconnecting the negative or
grounded. When positive feed wires extend into rooms, they shall
connect such wires to the positive wire on the entry before
connecting the power cable, and as soon as the power cable is
disconnected shall disconnect such wire from the wire on the entry.
They sha