E/MJ : engineering and mining journal . el ivi n the A similai opcrati i ith the Fli a bole being cul in the inha thai i onni i breathing bag %?- ? t ! > i, , ilamed. There was thereforeconvim ace thai leaks in the apparatus would provevery serious, if not fatal, whenoperating in poisonoxisuch as carbon monoxide. Itwas probably because of criti-cism of this character thai theCo.,. several years ago, changed it>mis to what sure type, inwhich a greater portion of theapparatus in use is pla -ure. The dinary tests, made with tin ? -how thai the reducing valve and inji rnish- ing the desired
E/MJ : engineering and mining journal . el ivi n the A similai opcrati i ith the Fli a bole being cul in the inha thai i onni i breathing bag %?- ? t ! > i, , ilamed. There was thereforeconvim ace thai leaks in the apparatus would provevery serious, if not fatal, whenoperating in poisonoxisuch as carbon monoxide. Itwas probably because of criti-cism of this character thai theCo.,. several years ago, changed it>mis to what sure type, inwhich a greater portion of theapparatus in use is pla -ure. The dinary tests, made with tin ? -how thai the reducing valve and inji rnish- ing the desired quanl producing rhe n maintain the circulation of air I Neither ol ilished this fact by testing the a punctured potash earl i My. The smokeln wearing the ratus in smol ? formaldehyi ill nol indi- ?til it is qi odisci ll mined in I in. would • - minoi i1 ;i, Ol n in actual mine re It was determinii kind- . which we v. dank otr t! i hnimi I the a tl ial. 9SG ENGIJNTrTRKINd AXD MINING JOUtiNAL Vol. 102, No. 23. FIGS. 3 AXD 4. U-TUBE IS ATTACHED TO THE BREATHING BAG AS SHOWN Later, we were able to obtain from the I iraeger companythree testing parts by which the various connections couldbe blinded and whereby proper connection could be madeto a pressure gage. These parts are lettered A, B and Cin the various illustrations. We endeavored at that timeIn induce this company to make a cap for the relief valveof the bag, but it objected to doing this on the groundthat some one might wear the apparatus with the cap inplace over the relief valve. We made two types of blanks for this valve, one whichfits tightly over the valve and the other made by solderingup the relief valve of an old bag. The former blank ispreferable, as it can be used without removing the reliefvalve. In the illustrations this valve is marked D. TheDraeger company is now furnishing a blank for thispurpose. In all discussions, and in talking with sales agents ofthe various apparatus, 1 have never see
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
