Wood Crib with One Crib Release Tripped at Pocahontas No. 4 Coal Bed, Helen, W. Va.
Description:
'Modified Longwall Mining with a German Coal Planer. Progress Report 2: Completion of Mining in three Adjacent Panels in the Pocahontas No. 4 Coal Bed, Helen, W. Va.'If this photograph is used for publication, please give credit to the Bureau of Mines, United States, Department of Interior.
Wood Crib with Both Releases Tripped and Crib Collapsed at Pocahontas No. 4 Coal Bed, Helen, W. Va.
Description:
'Modified Longwall Mining with a German Coal Planer. Progress Report 2: Completion of Mining in three Adjacent Panels in the Pocahontas No. 4 Coal Bed, Helen, W. Va.' If this photograph is used for publication, please give credit to the Bureau of Mines, United States, Department of Interior.
Sewall Coal Seam Worked by the New River Coal Company
Description:
'All white oak mines work the same seam of coal, viz: Sewall. THe face of one of the working places or rooms is shown in this picture. The coal averages about 48 to 50 inches in thickness. This working place is now ready to be cut by the undercutting machine, so it can be shot down be the miner and loaded into cars for transportation to the tipple. The white line on the roof in this picture is the center line of the room set by the engineers to guide the men operating the mining machine in driving the room straight.'
'Probably no phase of coal preparation requires the supervision and care that must be given to shooting practices. The type of explosive used is a safety powder known as "Duobel" and has been selected because it is most suitable for the coal mined in the White Oak Mines. Not only must the explosive be of the best quality and best suited for the work of breaking down the coal, but its use must be supervised and restricted. The proper amount to use; the size of the cartridge; the manner of tamping and many other details are looked after so that a maximum of lump and coarse coal is produced after shooting. This view shows the working place after the 'breaker shot' has been fired.'
'Probably no phase of coal preparation requires the supervision and care that must be given to shooting practices. The type of explosive used is a safety powder known as "Duobel" and has been selected because it is most suitable for the coal mined in the White Oak Mines. Not only must the explosive be of the best quality and best suited for the work of breaking down the coal, but its use must be supervised and restricted. The proper amount to use; the size of the cartridge; the manner of tamping and many other details are looked after so that a maximum of lump and coarse coal is produced after shooting. This view shows the working place after the 'breaker shot' has been fired.'
Proper Positioning of the Turbine Rotor in Its Casing
Date:
1960-1970
Description:
J.P. McGee, Acting Research Director, and Jack Smith, in Charge of the Gas Turbine Development Project discuss proper positioning of the turbine rotor in its casing.
