. Standardization of mining methods; a series of important articles reprinted from Engineering and mining journal. ial which is water-tight, to keep all moisture frompenetrating the cap through the junction between thecap and fuse. Whenever a sufficient quantity of fusesare capped and ready for use, they are put into specialfuse cans. These may be made by taking carbide cans,cutting them down about 9 in., fitting them with speciallids which are water-proof, and lining the inside withfelt i in. thick. The lids should be lined as well asthe cans. The fuses are coiled and placed inside thesecans
. Standardization of mining methods; a series of important articles reprinted from Engineering and mining journal. ial which is water-tight, to keep all moisture frompenetrating the cap through the junction between thecap and fuse. Whenever a sufficient quantity of fusesare capped and ready for use, they are put into specialfuse cans. These may be made by taking carbide cans,cutting them down about 9 in., fitting them with speciallids which are water-proof, and lining the inside withfelt i in. thick. The lids should be lined as well asthe cans. The fuses are coiled and placed inside thesecans and transported in this manner to the shafts, fromwhich they are transferred to the different undergroundfuse houses. The fuse cans should be sent back to the EXPLOSIVES 53 fuse house on surface to be refilled as the supply under-ground runs low. From the standpoint of efficiency, the capping of fusesby men specially employed for that purpose has provedto be a success at a number of mines. In one instance,two men do all the cutting and capping on the surfacefor the entire mine, averaging 3000 caps a day. This. Fig. 3. Adjustable Fuse Cutter work was formerly part of the duties of sixteen powdermen, who cut and capped fuse for their individuallevels, and who are now required to do repair work andcleaning tracks in the time formerly spent in crimpingcaps. At another mine, one man is employed in a well-ventilated fuse house underground, and cuts and capsfrom 1100 to 1400 fuses a day. Stemming or Tamping Stemming, or tamping, as it is called, is extensively used in practically all mines except metal mines. Its use has been in practice in coal and iron mines and in mines in England and on the Continent for many years. 54 STANDARDIZATION OF MINING METHODS but it is not extensively used in the metal mines inthis country. In Michigan, where many of the minersoriginally came from England, stemming is used, forthe reason that the men have been trained in thatcountry to the idea that stem
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