Report of the Bureau of Mines of the Department of Internal Affairs of ...

xcviii MINING LAWS OF PENNSYLVANIA. Off. Doc.
in his judgment, it is impracticable to comply with the foregoing requirement;
and mines where more than ten persons are employed,
shall be provided with a fan, furnace or other artificial means to produce
the ventilation, and all
stoppings between main intake and return
air-ways hereinafter built or replaced shall be substantially
built with suitable material, which shall be approved by the inspector
of the district.
Section 3.
All ventilating fans shall be kept in operation continuously
night and day, unless operations are indefinitely suspended, except
written permission is given by the mine inspector of the district
to stop the same, and the said written permission shall state the particular
hours the said fan may not be in
operation, and the mine inspector
shall have power to
withdraw or modify such permission as
he may deem best, but in all cases the fan shall be started two hours
before the time to begin work. When the fan may be stopped by
permission of the mine inspector a notice printed in the various
lai'guages used by persons employed in the mine, stating at what
hour or hours the fan will be stopped, shall be posted by the mine
foreman in a conspicuous place at the entrance or entrances to the
mine.
8aid printed notices shall be furnished by the mine inspector and
the cost therecf borne by the State: Provided, That should it at any
time become necessary to stop the fan on account of accident or
needed repairs to any part of the machinery connected therewith, or
by reason of any other unavoidable cause, it shall then be the duty
of