. Transactions. of the iron-notch, the pipe shouldproject farther. In either case the part of the pipe inside thefurnace should be thoroughly covered over with stiff clay, so asto protect it from any molten slag or iron. The pipe should be in the center of the iron-notch, and asnearly level as possible. Near the outer end of pipe there arefour holes, in. in diameter, in which to insert hooks forpulling out the pipe when the time conies. As soon as theblast is on the furnace, the gas will come through the pipe outinto the iron-trough, where there should be a wood fire to igniteit immediate
. Transactions. of the iron-notch, the pipe shouldproject farther. In either case the part of the pipe inside thefurnace should be thoroughly covered over with stiff clay, so asto protect it from any molten slag or iron. The pipe should be in the center of the iron-notch, and asnearly level as possible. Near the outer end of pipe there arefour holes, in. in diameter, in which to insert hooks forpulling out the pipe when the time conies. As soon as theblast is on the furnace, the gas will come through the pipe outinto the iron-trough, where there should be a wood fire to igniteit immediately. As the volume of gas increases, the gas-flameat the end of the pipe gets hotter and roars more, but does noharm. It is my practice to let this gas burn at the iron-notch BLOWING-IN A BLAST-FURNACE. 107 for 4 lir. after starting the blast, and then to pull the pipe andshut the notch. Shutting the iron-notch is one of the critical stages of blowing-in; but if everything is in readiness the work can be done in. 1«t^
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
