חו.
Tuesday, November 28, 1972
the safety harness should be attached to a life-line,
the free end of which should be held by an attendant on
the surface at the head of the shaft;
the person in the shaft should have easy means of
raising alarm;
whilst a person remains inside a shaft, adequate lighting and ventilation should be maintained in the shaft;
if presence of unknown gases is suspected, entry should not be attempted until the gases have been identified
and appropriate measures taken.
He said that safe and efficient equipment for identifying the
nature and concentration of a large number of gases were available and
that flames should never be used for this purpose.
"Advice on these gas detecting equipment can be obtained from
officers of the Industrial Health Division", he added.
/6
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