Transactions . until allrepairs were completed. At first the helmets were tested for air cir-culation and air tightness and the injector was tested by water gaugeaccording to the methods recommended by the Draeger Oxygen Ap-paratus Co. Six arrangements, covering these different tests, areillustrated in the catalogue and circulars of the company. After the above tests had been made on the oxygen apparatus, themen still complained about leaky helmets. Small quantities of gasentered the helmets and could not be detected by these methods. The METHOD OF TESTING DRAEGER OXYGEN HELMETS. 79 tests will
Transactions . until allrepairs were completed. At first the helmets were tested for air cir-culation and air tightness and the injector was tested by water gaugeaccording to the methods recommended by the Draeger Oxygen Ap-paratus Co. Six arrangements, covering these different tests, areillustrated in the catalogue and circulars of the company. After the above tests had been made on the oxygen apparatus, themen still complained about leaky helmets. Small quantities of gasentered the helmets and could not be detected by these methods. The METHOD OF TESTING DRAEGER OXYGEN HELMETS. 79 tests will not reveal any small leaks in the helmet or breathingbag, but test only the strong parts of the apparatus which seldom getout of order and not the weaker parts, such as the inflation tube, thehandle of the cleaning sponge, and the breathing bag, which fre-quently needed repairs. Aside from these objections, it was not practicable to spend a largeamount of time in making a number of tests when the oxygen helmet. Fig. 1.—Pressure Test of Draeger Oxygen Helmets. apparatus was used by both the day and the night shift men. It wastherefore desirable to find some device which would test both theweak and the strong parts of the apparatus within 2 min. 3. The Method Used. The following method was used at the Copper Queen mine and wasfound to fulfill the necessary conditions. Fastened to the lid of eachbox containing a complete set of apparatus was a card bearing the 80 METHOD OF TESTING DRAEGER OXYGEN HELMETS. determined pressure and suction records, similar to the followingexample: Box, No. I. Check, cm. Helmet, No. 5,000. Pressure tube, 4& inches water gauge. Apparatus, No. 5,500. Suction tube, 4 inches water gauge. The testing device consists of a wooden block, A, Fig. 1, which fitsinto the helmet, taking the place of a mans face, and is provided witha water gauge on the side next the operator, for recording total pres-
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
