The Encyclopedia Americana: The International Reference Work, Volume 7Americana Corporation, 1960 - Encyclopedias and dictionaries |
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Page 152
a one bulldozers , the result is an opencut or surface mine , sometimes known as a strip mine . Underground Mining Systems . — Most of the world's coal is obtained from underground mines . The two principal systems employed in mining ...
a one bulldozers , the result is an opencut or surface mine , sometimes known as a strip mine . Underground Mining Systems . — Most of the world's coal is obtained from underground mines . The two principal systems employed in mining ...
Page 154
In most of the world's modern mines drilling , shearing , loading , and 154 underground transportation , as well as the ... of the run - of - the - mine coal for the market , are handled by complicated , electrically powered machinery .
In most of the world's modern mines drilling , shearing , loading , and 154 underground transportation , as well as the ... of the run - of - the - mine coal for the market , are handled by complicated , electrically powered machinery .
Page 155
Resim men George Pickow from Three Lions Foreman testing the flow of air through a mine tunnel . The device suspended from his belt is a methane gas detector lamp . ters . See also MINE ACCIDENTS AND THE UNITED STATES BUREAU OF MINES ...
Resim men George Pickow from Three Lions Foreman testing the flow of air through a mine tunnel . The device suspended from his belt is a methane gas detector lamp . ters . See also MINE ACCIDENTS AND THE UNITED STATES BUREAU OF MINES ...
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Bibliographic information
| Title | The Encyclopedia Americana: The International Reference Work, Volume 7 The Encyclopedia Americana: The International Reference Work |
| Publisher | Americana Corporation, 1960 |
| Original from | University of Illinois at Urbana-Champaign |
| Digitized | 9 Jun 2022 |
| Export Citation | BiBTeX EndNote RefMan |