E/MJ : engineering and mining journal . It is provided with a handle and can beraised by a man standing on the car or by the useof a bar operated when one is standing on the gate has a bolt on each end and operates onhinges, and the result obtained is similar to thatsecured by use of the boards. the larger drifts, with, of course, proportionatelygreater dimensions. Such a door may be operatedeither from the level, in a hand tramming dJrift, orfrom the floor above, in a motor-haulage drift. Inthe latter case, the chute door is, of course, suffi-ciently high so that the operator can op
E/MJ : engineering and mining journal . It is provided with a handle and can beraised by a man standing on the car or by the useof a bar operated when one is standing on the gate has a bolt on each end and operates onhinges, and the result obtained is similar to thatsecured by use of the boards. the larger drifts, with, of course, proportionatelygreater dimensions. Such a door may be operatedeither from the level, in a hand tramming dJrift, orfrom the floor above, in a motor-haulage drift. Inthe latter case, the chute door is, of course, suffi-ciently high so that the operator can open it bystanding in the pony set and also punch the chutefrom that floor. This class of door is in common useon .main haulage drifts where block caving is themining method employed. However, the chutesleading directly to the main haulage level are usuallysituated in ground that is not vei-y heavy and willtherefore not be subject to change. Fig. 4 represents an iron door which is actuatedby means of a slide and small gear wheels on the.
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
