The Wallace miner. [volume] (Wallace, Idaho) 1907-current, 1924-02-07


to date for ventilating blind ends.
Flexible tubes for use in metal mine
workings are cheaper in first cost.
much more easily and economically
installed take up less room and de-
liver more air than most of the same
sized rigid tubes. especially those
with stove pipe joints. BY flexible
tubing methods quantities from 1000
to 5000 cubic feet of air per minute
are readily released at the face of the
blind ends up to or even over 1000 feet
from circulating air. Velocity of air
at release end of these flexible tubes
Is from several hundred to four or five
thousand lineal feet per minute. The
places with hot rock or water ESQ de-
grees f. or over) quickly give that
temperature TO air without circula-
ton, but when flexible tubing is used
and outside air supplied air temper
atures at working faces are readily
reduced 10 to 20 or even more degrees
+. When the 1000 or morec ubic feet
of air per minute delivered by flexible
tubes is liberated, it not only lowers
temperature and humidity at the
working faces but also removes gases
and dusts, replacing them with purer
and cooler air The air released from
end of the flexible tube generally has
velocity of several hundred to several
thousand feet per minute. and the
comfort given by this large quantity
of moving air would in itself more
than justify the cost of the installa-
tion. even if there were no additional
benefits.
Benefits of Air Circulation.
It has been found by investigators
that even when air is practically sat
urated with moisture and with tenn
perature up TO 80 degrees F., the Civ
ing of velocity of few hundred feet |
per minute allows of performance of |
work with little or no unfavorable eff |
feet while working in stagnant air |
above so degrees f. has definite i'll eff |
feet especially on body temperature |
and pulse beat, and TO a less extent |
on blood pressure. Hence for such |
places the use of flexible tubing is of !
decided benefit.
Investigators in South Africa found
that merely by giving of movement of
a few hundred feet per minute to
saturated air in which |
native laborers were working, air |
being about 81 degrees !
F., the men delivered about As per
cent more work than in stagnant all |
yet did not know of the change in
conditions or that they were working /
more vigorously.
Results of Good Ventilation.
With increasing comfort of work
ing places and decreasing of unhealth
ful conditions broubht about by ven
ulation by flexible tubes, there is
greatly decreased labor turnover and
decrease of temporary ILL
nesses such as headache, nausea. etc;
and decrease of lost time while I'M
derground, as well as of days absent
from work. When the air of working
places Is hot, stagnant and impure,
there is danger of excessive accident
which is removed upon
giving of adequate ventilation by
flexible tubing system.
Many investigators who have spent |
much time as to cause and prevention /
of miners consumption now believe |
that by far the best preventive is the
of ample quantities of
pure. fresh air at working places; to
accomplish this there are certainly no
better agencies than the use of flexi-
BILE tubing and blowers.
Mining companies, both where air
Is hot and humid and where the air is
cool but impure, have found efficiency
IF workers so greatly increased by
of fan and tubing sys
ems that there has been not one case
II abandonment of the system, though
here are several hundred instances
It hand of it's adoption.
Serial 1851 may be obtained from
he department of the interior, bureau
If mines. Washington, D. c.