934                                       LAWS OF MARYLAND                             [Ch.

MOVED BY A BLOWER FAN AND TUBING; ONLY LINE BRATTICE
SHALL BE USED FOR THIS PURPOSE; AND

(6) THE FAN AND TUBING SHALL BE INSPECTED
AT LEAST TWICE DURING EACH WORKING SHIFT.

REVISOR'S NOTE: This subsection presently appears
as Article 66C, section 567(b) of the Code.
The only changes made are in style.

(D) VOLUME OF AIR.—

(1)    IN GENERAL.—THE MAIN INTAKE AIR
CURRENT SHALL BE DIVIDED INTO SPLITS UTILIZING AIR
CROSSINGS, WHERE NEEDED, TO VENTILATE EFFECTIVELY ANY
PART OF THE MINE. THE NUMBER OF WORKERS ON A SPLIT
SHALL BE LIMITED TO 75. THE QUANTITY OF AIR REACHING
THE LAST OPEN CROSSCUT IN ANY PAIR OR SET OF ENTRIES
SHALL NOT BE LESS THAN 6,000 CUBIC FEET A MINUTE.
HOWEVER, THE QUANTITY OF AIR REACHING THE LAST OPEN
CROSSCUT IN ANY PAIR OR SET OF ENTRIES IN PILLAR
SECTIONS MAY BE LESS THAN 6,000 CUBIC FEET A MINUTE,
IF AT LEAST 6,000 CUBIC FEET OF AIR A MINUTE IS BEING
DELIVERED TO THE INTAKE END OF THE PILLAR LINE. MINES
OPERATING WITHOUT THE PRESCRIBED QUANTITY OF AIR IN
THE LAST OPEN CROSSCUT OF EACH PAIR OR SET OF ENTRIES,
ON JULY 1, 1973, MAY CONTINUE TO OPERATE IN THIS
MANNER, BUT PROMPT ACTION SHALL BE TAKEN TO DELIVER
THE REQUIRED AMOUNT OF AIR IN THE LAST OPEN CROSSCUTS
OF EACH PAIR OR SET OF ENTRIES IN THE MINE.

(2)   DILUTION OF SMOKE.—THE AIR CURRENT AT
EVERY WORKING FACE SHALL HAVE A SUFFICIENT VOLUME AND
VELOCITY TO DILUTE AND CARRY AWAY SMOKE FROM BLASTING
AND ANY FLAMMABLE OR HARMFUL GAS.

(3)    MEASURING---AT LEAST ONCE EACH WEEK,

THE MINE FOREMAN, HIS ASSISTANTS, OR ANOTHER COMPETENT
PERSON DESIGNATED BY THE MINE FOREMAN, SHALL MEASURE
THE VOLUME OF AIR NEAR THE MAIN INTAKE OR MAIN RETURN,
THE AMOUNT PASSING THROUGH THE LAST OPEN CROSSCUTS OF
ENTRIES, AND THE VOLUME OF AIR IN EACH SPLIT. A
RECORD OF THESE MEASUREMENTS SHALL BE KEPT IN A BOOK
ON THE SURFACE OF THE MINE AND IS OPEN FOR INSPECTION
BY ANY INTERESTED PERSON.

REVISOR'S NOTE: This subsection presently appears
as Article 66C, section 568 (a) through
(c) , inclusive, of the Code. The only
changes made are in style.