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Coal Measures and Coal Mining in Iowa, including paleontology and a discussion on the coal formation; also the methods of mining by Russell T. Hartman, 1898

Coal Measures and Coal Mining in Iowa by Russell T. Hartman, 1898, Page 203

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[page]203.[/page] from the main engine house. A crude method of ventilation used in country mines is by means of a fire burning at the bottom of the air shaft. In hoisting the coal to the surface, the mine cars are run one at a time on "cages" or elevators which carry them up the shaft. These [?There?] are two cages working alternately up and down in the shaft. The coal is not merely carried to the surface of the ground, but is carried nearly to the top of the shaft tower (See Places of Pekay Top Works) where is [?it?] is dumped qutomatically or by hand and runs down over inclined screens which allows all but lump coal to pass through. Under these screens may be another set of inclined screens which take out
 
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