Some Great Commodities (Classic Reprint)
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| Partner: | buecher.de |
| Hersteller: | Forgotten Books (Miller, Edith M.) |
| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from Some Great Commodities Adequate coal supplies are fundamental importance to every industrial country. The whole structure of modern production has been built on coal as a cheap source of power. In spite of the development in the use of water power and of petroleum and its products, the position of coal as the main source of industrial power is unchallenged. Coal is widely distributed throughout the world and few countries are without at least a small supply. The resources of the various countries, however, differ widely in commercial value because of variations in the quality of the coal and in the degree of ease with which it can be mined and marketed. Fairly complete surveys of the coal resources of Europe and of the United States and Canada have been made, but as to the remainder of the world, knowledge of both the extent of the fields and the quality of the coal is imperfect. So gradual is the evolution of coal through all the stages from peat to graphite that it is difficult clearly to define its different grades. The United States Geological Survey, however, divides coal into six classifications, namely, lignite, sub-bituminous, bituminous, semi-bituminous, semi-anthracite and anthracite. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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