Public works . HOOK FORLOWERINGCHARGE OFEXPLOSIVE to the bottom of the well is securely fitted over thistip and lowered into the hole ahead of the shell toserve as an anchor for it. FIRING SQUIBS The charge being seated, the next step is to explodeit. This can be done by either the jack-squib or theelectric squib. The jack-squib consists of galvanizedpipe jx)inted at the lower end, which is filled as fol-lows : Sand is poured into the pipe to a depth ofabout 6 inches; a cartridge of 60 per cent Straight 166 PUBLIC \\ O R K S Vol. 52, No. 9 =>tM GAUGE ^AND. ELECTRICBLA5TING CAP
Public works . HOOK FORLOWERINGCHARGE OFEXPLOSIVE to the bottom of the well is securely fitted over thistip and lowered into the hole ahead of the shell toserve as an anchor for it. FIRING SQUIBS The charge being seated, the next step is to explodeit. This can be done by either the jack-squib or theelectric squib. The jack-squib consists of galvanizedpipe jx)inted at the lower end, which is filled as fol-lows : Sand is poured into the pipe to a depth ofabout 6 inches; a cartridge of 60 per cent Straight 166 PUBLIC \\ O R K S Vol. 52, No. 9 =>tM GAUGE ^AND. ELECTRICBLA5TING CAP
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
