Caption: Book - Mining Engineering Overview (1913)
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I AMI' AND I I d
Th< safety lamp, mine gas and explosibility of dust laboratory ontains an a lortment ot iel ncl electric mine lamps: magnetic-locking and lighting devic sf and the most improved applian< s for t iting lamps. It also contains apparatus for gas analysis and a photometer room for determining the lighting r po of mine hghtim devil
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laborator\ is |uipp< I foi the determination il'ili' < l coal dual and othei line mal rials >