The Encyclopedia Americana: The International Reference Work, Volume 7Americana Corporation, 1960 - Encyclopedias and dictionaries |
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Page 152
Most of the world's coal is obtained from underground mines . The two principal systems employed in mining underground coal are the room - and - pillar method and the longwall method . In the first method pillars of coal are left to ...
Most of the world's coal is obtained from underground mines . The two principal systems employed in mining underground coal are the room - and - pillar method and the longwall method . In the first method pillars of coal are left to ...
Page 157
One of the most significant projects for putting coal to more effective use is the coalfueled gas turbine engine . The Locomotive Development Committee of BCR is making progress with this turbine , and estimates that when it becomes ...
One of the most significant projects for putting coal to more effective use is the coalfueled gas turbine engine . The Locomotive Development Committee of BCR is making progress with this turbine , and estimates that when it becomes ...
Page 158
In addition to these major research projects , which are of vital importance to the future utilization of coal , about 50 other projects , including work on new space heaters , improved gas producers from coal , new heat pumps run by ...
In addition to these major research projects , which are of vital importance to the future utilization of coal , about 50 other projects , including work on new space heaters , improved gas producers from coal , new heat pumps run by ...
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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 |