Transactions . Proceedings JFRI ofM& - 71 Vol XXIPlat/-: II Scale 1 Chain to i^Indi,. .AndT Reii Newcast! WORKING COAL BY LONG-WALL. 5 line moving* every day, the weight seldom, if ever, crushes to any extent,but as a rule, bends down and settles gradually upon the pack two orthree yards from the face. The packs for the support of the roof shouldbe kept well built up, and as near the face as practicable. At Annesleythere is close upon a thousand yards of face on a thread, and althoughsuch is the case the roof never breaks down in the benks unless thestalls are allowed to stand. There i
Transactions . Proceedings JFRI ofM& - 71 Vol XXIPlat/-: II Scale 1 Chain to i^Indi,. .AndT Reii Newcast! WORKING COAL BY LONG-WALL. 5 line moving* every day, the weight seldom, if ever, crushes to any extent,but as a rule, bends down and settles gradually upon the pack two orthree yards from the face. The packs for the support of the roof shouldbe kept well built up, and as near the face as practicable. At Annesleythere is close upon a thousand yards of face on a thread, and althoughsuch is the case the roof never breaks down in the benks unless thestalls are allowed to stand. There is also a great saving in timber where there is a face of coalmoved every day, as the weight seldom, if ever, crushes the wood, ifthe back rows of props are removed as the face of the stalls back rows of timber should never be allowed to be more than six feetfrom the face, and particular care should be taken that they are removed,as the safety of the stalls depends to a certain extent upon this, which ifneglected very often throws the weight forward instead of allowing itto si
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Keywords: ., bookcentury1800, booksubjectmechan, booksubjectmineralindustries
