 | Georg Hartwig - 1871 - 570 pagina’s
...coal, ten feet thick, breaks out in the steep cliff at the water's edge. Horizontal galleries maybe driven everywhere at very slight expense, and so worked...with coal, and attached to each other, glide down on a railway so as to deliver their burden into barges moored to the river's bank. The same seam may... | |
 | William Rathbone Greg - 1874 - 196 pagina’s
...feet thick, commonly called the Pittsburg seam, breaking out in the steep cliff at the water's edge. Horizontal galleries may be driven everywhere at very...with, coal and attached to each other, glide down on a railway, so as to deliver their burdens into barges moored to the river's bank. The same seam... | |
 | Jacob Harris Patton - 1891 - 152 pagina’s
...magnitude of this seam of coal, says, " Horizontal galleries may be driven everywhere at very little expense, and so worked as to drain themselves, while...with coal, and attached to each other, glide down on a railway, so as to deliver their burden into barges moored to the river's bank." He might have... | |
 | Malcolm Keir - 1926 - 346 pagina’s
...mine in operation. Lyell described it as follows: "Horizontal galleries may be driven everywhere at slight expense and so worked as to drain themselves,...plate, on a railway so as to deliver their burden to barges moored to the river's bank." Many of the soft coal veins, like the one at Pomeroy (No. 146),... | |
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Horizontal galleries may be driven everywhere at very slight expense, and so worked as to drain themselves, while the cars, laden with coal and attached to each other, glide down on a railway, so as to deliver their burden into barges moored to the river's... 
