Transactions . tions; but,during several months in which the apparatus has been at work,no such record has been made. It may be explained that the zero-line of the chart has beentaken at the height at which the furnace is as full as it can befilled without having the stock interfere with the bell; but thetest-rod is raised higher than this, as explained above. The completeness of the record is more noticeable after alittle experience with the device than would be expected froma cursory examination of the chart. It is practically impos- 86 STOCK-LINE RECORDER FOR IRON BLAST-FURNACES. sible to b
Transactions . tions; but,during several months in which the apparatus has been at work,no such record has been made. It may be explained that the zero-line of the chart has beentaken at the height at which the furnace is as full as it can befilled without having the stock interfere with the bell; but thetest-rod is raised higher than this, as explained above. The completeness of the record is more noticeable after alittle experience with the device than would be expected froma cursory examination of the chart. It is practically impos- 86 STOCK-LINE RECORDER FOR IRON BLAST-FURNACES. sible to beat the instrument, and make it show a good rec-ord, when a bad one was called for by the circumstances—afact which the fillers themselves have come to appreciate. The first night the machine was in operation, the night-shiftwere late coming out, and knowing that the machine was oper-ated by the opening of the bell, the top-filler opened the bellwithout waiting to put anything on it, intending to show thereby. Fig. 4.—Chart from Stock-Line Kecorder at Furnace No. 2,Nov. 10 and 11, 1904. that they had already put up a charge. Of course the test-rodsimply rose and descended again to its former level, indicatingperfectly what had been done. The admonition delivered thenext morning, with an accompanying explanation of the futilityof such tricks, has served to prevent their repetition. So far, there has been no cost for attendance and man who oils the hoist- and bell-machinery once a day alsoputs a little oil on the working-parts of the recorder below. STOCK-LINE RECORDER FOR IRON BLAST-FURNACES. 87 (The pulleys on top are not oiled at all, on account of the dust.)The furnace-foreman puts in a new chart, winds the clock andputs ink in the pen once a day; and this is absolutely all theattention the apparatus receives. It was feared at first that,the top of the furnace being rather hotter than good practicepermits, trouble might arise with the chain and the test-rod,an
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
