Results 201 - 205 of 205

• Use of Vertical Boreholes for Assisting Ventilation of Longwall Gob Areas
  3/1/1969 - Technical Progress Reports
  An experimental degasification program using a vertical borehole and vacuum pump to drain gas from the gob area of a longwall panel was successful at Bethlehem Mines Corporation, Cambria Division, No. 33 coal mine. Sixty-one million cubic feet of methan...
• Gas Migration Characteristics of Coalbeds
  3/1/1969 - Technical Progress Reports
  The Bureau of Mines conducted drilling studies in the Pocahontas No. 3, the Pittsburgh, and a western coalbed to establish the gas migration characteristics for each.
• Removing Methane (Degasification) from the Pittsburgh Coalbed in Northern West Virginia
  1/1/1962 - Reports of Investigations
  A joint investigation by the Bureau of Mines and the Christopher Coal Co. at the Humphrey No. 7 mine, operating in the Pittsburgh coalbed in northern West Virginia, was undertaken to gain more insight concerning the hazardous emission of methane gas in ...
• Approved Explosion-Proof Coal-Cutting Equipment
  2/1/1920 - NIOSH/USBM numbered publications
  This bulletin deals with the general theory of protection from fire damp and also covers a detailed description of the apparatus that has been tested and approved.
• The Explosibility of Coal Dust
  1/1/1911 - NIOSH/USBM numbered publications
  This bulletin traces the growth in the belief in the explosibility of coal dust, summarizes the experiments and mine investigations that have established this belief, and gives the present (1911) status of preventive measures.