. American foundry practice . eytapped out they would have a man or two striking orknocking the bar into the breast with heavy sledge hammers,and when in it would take four or five men to pull it out. Of course, there is sometimes iron and scrap used thatwill make a deal of slag, and it is hard work to keep a breastor tapping hole clean, and melters are often exhausted intrying to do so.* If they would only once adopt the planhere described, they would be astonished at the ease withwhich they could do their tapping. In tapping out a cupola for the first ladle, there is oftentrouble on account
. American foundry practice . eytapped out they would have a man or two striking orknocking the bar into the breast with heavy sledge hammers,and when in it would take four or five men to pull it out. Of course, there is sometimes iron and scrap used thatwill make a deal of slag, and it is hard work to keep a breastor tapping hole clean, and melters are often exhausted intrying to do so.* If they would only once adopt the planhere described, they would be astonished at the ease withwhich they could do their tapping. In tapping out a cupola for the first ladle, there is oftentrouble on account of the iron not melting as fast as it oughtto, or as fast as it will after a few minutes. The iron,especially if hard, chills in the hole, and when tapping out Ihave often seen the whole breast knocked in to get the ironout. To remedy this, take a one inch round core, 4 or 5 * This has reference to cupolas that are not slagged out through aregular slag hole in the rear of the cupola. TAPPIJS^G OUT AND STOPPING UP CUPOLAS. 333. 334 TAPPIi^G OUT AND STOPPING UP CUPOLAS. long, made with plenty of sea-coal or blacking, and whenthe iron is melting or at a fair stream, take the core andpush it into the hole, stop over it, and when you take outfor the first ladle you will have no trouble. There is another thing a great many melters have a habitof doing when stopping up a cupola. That is, they willpush the stopping against the running stream to get the holestopped u]), which always causes a splatter, and sometimeswashes the stopping off the stick ; whereas, if they wouldhold the stopping above the stream, and when near the holepush it down on a slant, they would not be so liable to burnany one, let the ladles flow over, or, worse yet, let all theiron run out on the floor, which often results in large loss. The mixtures of stojoping have often a deal to do withaccidents and trouble. About the best stopping for ordinarypurj)oses is new moulding sand dampened with clay will not
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