ALBERT C. RITCHIE, GOVERNOR. 727

who shall act as shot-firers; whose duty shall be to charge,
tamp, and fire all holes properly placed by the miners, and to
refuse to charge any holes not properly placed; and whenever
such shot-firers are required to be employed, it shall thereafter
be a misdemeanor for any miner to charge, tamp or fire any
blast within such mine, or for any operator to permit any
person other than a shot-firer so to charge, tamp or fire any
blast within any such mine; Provided, That regulations denn-
ing the qualifications of persons competent to discharge the
duties of shot-firers, and to govern shot-firing, including rec-
ords, warnings, and notices, shall be made by the Bureau.

SEC. 147. The operator shall prescribe the hours., and when
practiced the rotation of blasting within any mine, and shall
post notices thereof at the mine office and at each entrance to
the mine.

SEC. 148. The Bureau shall make regulations prescribing
the duty of each miner in regard to blasting, including min-
ing, cutting, drilling, securing of roof and coal before and
after shooting, and warning to persons who may in any manner
be endangered thereby; but shooting off the solid is hereby
prohibited.

TITLE VIII—WEIGHTS AND MEASURES.
CHAPTER XXIII—Compensation to Workmen for Labor.

SEC. 149. The operator of every coal mine where miners
are paid by weight, shall provide and hereafter maintain
suitable and accurate scales, which scales shall be examined,
tested, and kept in thorough repair by a competent person
employed by such operator, at least once in every six months;
a correct record shall be kept of all coal so weighed, which
record shall be open at all reasonable hours to the inspection
of miners employed at such mine. Such operator shall keep
at the mine weighhouse such standard United States test
weights as may be prescribed by the Bureau, for use in testing
such scales.

SEC. 150. The operator of every such mine, where miners
are paid by weight, shall not, before weighing the coal, pass
the same over any screen or other device which shall take
any part from the value thereof, or otherwise remove any of
the coal; and shall duly credit the just and merchantable
weight thereof to the employee sending the same to the sur-
face.