WM. PRESTON LANE, JR., GOVERNOR. 1043

(r) "Shaft" means an opening, the axis of which is
approximately vertical, extending downwards from the
surface; and shall include an underground shaft driven
between two levels.

(s) "Slope" includes an inclined opening in a dipping
coal and/or fire clay bed and an inclined tunnel to a coal
and/or fire clay bed.

(t) "Superintendent" means the person who shall, on
behalf of the operator, have immediate supervision of one
or more mines.

(u) "Tunnel" means a level or inclined passageway
driven mainly through barren strata. It may or may not
come to the surface.

(v) "Ventilating Current" means a current of air cir-
culating throughout the mine excavations, of such purity
that it shall contain not less than 19. 5 per cent, of oxygen
nor more than (0. 75) three-quarters of one percent, carbon
dioxide. The district mine inspector shall, whenever he has
reason to suspect an excessive proportion of carbon dioxide
or insufficient oxygen in the atmosphere of any mine, take
such tests as the Bureau may prescribe, and upon dis-
closure of a ventilating current below or approaching
minimum standard, require the operator by written safety
order to improve the ventilation immediately.

(w) "Working Place" means a room, breast, entry
cross-cut or pillar where coal and/or fire clay is being
mined or extracted and where one or more miners per
working shift of the mine are regularly employed until
the place is finished or stopped.

34. (a) It shall be the duty of each inspector to see to
the strict enforcement of all laws and regulations relating
to mining; to investigate all violations thereof; to file
complaints and to make affidavits against any violators be-
fore the proper courts or tribunals, and to see to the en-
forcement of all penalties prescribed for disobedience to
such laws and regulations. Each of such inspectors shall
exercise sound discretion in such enforcement; if in his
judgment any matter, thing or practice in or connected
with any mine is or may become dangerous or defective
and thereby endanger the bodily safety of any person, such
inspector may give written notice to the operator of such
mine by way of special safety order, a copy of which shall
also be sent to the Chief Mine Engineer; in which safety
order shall be stated in detail the particulars wherein such
matter, thing or practice is or may become dangerous or