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Unidentified man pointing to rock feature.
'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 by the miner and loaded into the cars for transportations 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.'
'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.'
This picture shows the thickness of the coal seam in relation to a normal doorway.