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Show ULAUTINO POWDElt. l,ni.l llrrl.f.l Prom las ot Two KlniU, ,S'llro n,ler niul black iHiwder may oli'ii 1 imployiil to nilMiutiiKu In lb same hot, where lurgu iuiishs of reek nru to bo dUloilgul by n slngl series of blasts. Holes in nrlHcd nt stntnl illsliuuti nirt, Wiinlly trn to slxtirn tut, niul set baik from Hi fnti' a similar dlstunce, Xft online lo lb diameter of the round Theeo boles nro gcnernlly tnrie.l by striking- th drill with n hammer, but nru llnlshiil by "churning" "churn-ing" Thy nr mftdr twelve to twenty twen-ty fiit dii'P. again del-ending on th chnrniterof the ground. Whin llulsheil they nru ihniuhernl-thnt Is, n smnll lumitlt), one to tbriti sticks, of No. 1 laiwder Is exploded In th Inittoui of each for Hie purisiMi of shuttering Hi ruck nlmtit the bottom of tho bole to mnk sunn' for n hetivlor rhnri: of powder nt the tiottoiu. Then n quantity quanti-ty of nltro (Hiwilcr, nnd sometimes n keg nr more of blnrk mwilcr Is iiunil Into eneli hoi, nud th si t or boles Is dlschnrgiil by lb electric ssikr or by fuses cut to discharge ns closely together to-gether ns possible, though tho latter loai-a the Iwiiellt uf coulumiKirntioous dlsi hnrgul by Hid eloitrl. spark or by second or two elapses Ivtween the explosions. ex-plosions. Tlm nltro powder, being n detoimllv romiKiutiil, explodes Immediately, Imme-diately, shattering th surrounding rotks; th blnck powilir, being n com-bustlr com-bustlr coiuKitiUil, exerts Us fnrcu moro slowly nnd lifts tho fractured rink tnnss, throwing It out of Us oi. Hon nud ri'tiderlug It nii'mslblo to Iho miner, 'lids ibms of blasting Is pnr-tli'ulnrly pnr-tli'ulnrly sultnl to niien-cut work, wher It Is not deslrnblo to si alter Hi rwk by Hi force or Iho blast, Mining nnd Kcletilllle Frivs. |
