. Transactions of the Institution of Mining Engineers . o the apparatus. When the main vaWe S isopened, oxygen passes along thetube via the union f/, past thepressure-gauge F, and into thecirculatory system of the appara-tus just above the cartridge essential point is that oxygenis only admitted to the apparatus when the pressure-knob D is pressed—that is, the supply of oxygen is not automatic, but is controlled by thewearer as desired. If Dis not pressed, no oxygenpasses beyond the pressure-gauge F. It is thus ofimportance to wash all air,and therefore nitrogen,from the apparatus withpur
. Transactions of the Institution of Mining Engineers . o the apparatus. When the main vaWe S isopened, oxygen passes along thetube via the union f/, past thepressure-gauge F, and into thecirculatory system of the appara-tus just above the cartridge essential point is that oxygenis only admitted to the apparatus when the pressure-knob D is pressed—that is, the supply of oxygen is not automatic, but is controlled by thewearer as desired. If Dis not pressed, no oxygenpasses beyond the pressure-gauge F. It is thus ofimportance to wash all air,and therefore nitrogen,from the apparatus withpure oxygen before adjust-ing the mouthpiece. Thispoint is emphasized in themanufacturers instruc-tions. The apparatus in use iscool, but the weight-distribution is bad, and itpossesses certain defects,due to the position of thebreathing-bag, as previous-ly mentioned, when tra-versing small mine gal-leries ; also it is desirable to have an automatic delivery-valve controllingthe supply of oxygen. The cylinder V acts to a certain extent as Fig. 1.—Flow Diagram of Dr^jer1-HOUR
Size: 1239px × 2016px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectmineralindustries
