Articoli correlati a The Mining engineer Volume 26
Sinossi
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 Excerpt: ...removed by the tapered trailer-bar to the sleeve: this being die to the increased speed of the extreme end of the bar. The writer thought that this bar could be improved, and he has received a 4i feet parallel bar, with cutter-holes sunk in the thread (Figs. 6 and 7). These holes are countersunk down, so that the heads of the cutters may enter them, thus supporting and strengthening the cutters. The holes are arranged spirally and, by this special arrangement, not more than three or four teeth can come into direct contact 24 VOL. XXVI.-l'.WIlKK, with the holing at the same moment; and, therefore, less care is necessary in charging a bar with the cutters, so as to place them in a straight line. Road-laying.--In many collieries, the road-laying is done by the men working the machine, during the shifts cutting, and this plan was adopted, although it is different from the arrangement previously adopted when coal-cutting; but it was recognized that the greatest proportion of time during the cutting shift was absorbed in road-laying, probably due to the exceptional hardness of the holing. The men working the machine have not time to pass over the rails during the time it is working, consequently the machine has to stand while the road is being laid, and so great is the strain on the rails that each rail has to le most carefully and securely spragged. Kails were, then, supplied for the entire length of the workingface, in 9 feet lengths, weighing 29 pounds to the yard, and free from nails or fishplate-holes, and a man and a boy were appointed to lay the road for the coal-cutting machine. This work is done during the opposite shift to the cutting-shift, when possible, and is examined and reported upon at the close of each shift by a deputy who is well versed in mac...
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