. Transactions of the Institution of Mining Engineers . Fig. 1.—Flow Diagram of Dr^jer1-HOUR Fig. 2.—Enlarged View of Pressure-gaugk,Pressure-knob, and Cooling-tube. 1920-1921;] SMART NOTES ON GERMAN MINE-RESCUE APPARATUS. ,5 Fig, 2 is a larger view of the pressure-gauge, pressure-knob, and30oling-tube. T is a, lock-nut for fastening the cylinder C. Fig. 3 shows the apparatus in use, with anarmy gas-mask attached to the mouthpiece. Themouthpiece and wire nose-clip of ordinary designwere usually used. The makers claim 45 minutes as being theuseful life of the apparatus when doing work;but
. Transactions of the Institution of Mining Engineers . Fig. 1.—Flow Diagram of Dr^jer1-HOUR Fig. 2.—Enlarged View of Pressure-gaugk,Pressure-knob, and Cooling-tube. 1920-1921;] SMART NOTES ON GERMAN MINE-RESCUE APPARATUS. ,5 Fig, 2 is a larger view of the pressure-gauge, pressure-knob, and30oling-tube. T is a, lock-nut for fastening the cylinder C. Fig. 3 shows the apparatus in use, with anarmy gas-mask attached to the mouthpiece. Themouthpiece and wire nose-clip of ordinary designwere usually used. The makers claim 45 minutes as being theuseful life of the apparatus when doing work;but after testing it from a practical point ofview, it is more satisfactory to regard it as ahalf-hour set. The Magirus Half-hour Apparatus.—Theessential feature in this apparatus was theabsence of any alkaline absorbent for removingthe carbon dioxide in the exhaled air. Theapparatus is fitted with a reducino-valve {R. F.,Fig. 4), and in the following test of theapparatus this was set to deliver 3 litres ofoxygen per minute. An automatic relief-valve(Z>, Fig. 5), which opens on exhaling an
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectmineralindustries
