V  
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 I; coNTi;NTs · i
  Page _l
  Introduction _.__..... V V V VV __,...................... 1  
  Ackiiowleclgnieiits .._. VV ...,_. VV ................._..4. 2 gl
ii General safety provisions .._... V _........ V VV ...,... 3 ll
e Prevention of accidents from falls of roof and coal ,,_, V V 10 F
g Typical examples of accidents from falls of roof and {
S coal _ffe_eee V VV eeefre VV V e..._._e_ V V ee.._.Y V ee.. 10
E Questions and answers .,,___ VVV, ____,,__._ VV ._.., 12 `
  Inspection and testing of roof and coal ......,. 13 v_
Preventing falls of roof and coalV VV, ,,,. V .... VVV 16
; Timbering systems .... V V VV V V V ,,_f, VV VVV VV V V 20 »·
  Action of roof_ ___ _ V V V V V V V V __ _ 22
  Timbering methods ..,,_ V V VVV _, V V 23
i Preventing roof and coal accidentns in mechanized
, mining ......_e... VVVVVVVVVVV   V ,,,,_ 42 `
. Prevention of accidents from mine liaulageVVV V V V V VV 49
g Typical examples of haulage acei