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History of coal mining
Содержание
Coal mining is a worldwide basic industry. The existence of vast coal reserves in many parts of the world guarantees its future importance. There is archeological evidence that coal was burned
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Слайды и текст этой презентации
Слайд 3The Hopi Indians (now – the southeastern United States) mined
coal and used it for heating, cooking and in ceremonial
chambers as early as the XIIth century AD; in the XIVth century they used in industrially in pottery making.
Слайд 4In the first shafts mines, coal was loaded into baskets
that were carried on the back of men and women.
Sometimes they were put on wooden sledges or trams that were then pushed through the main haulage roadway. Sledges were pulled first by men and later by animals.
Слайд 5The introduction of the steam engine to hoist coal was
a major turning point for the industry. Compressed-air locomotives, which
appeared in the 1880s were expensive to operate. Electric locomotives, introduced in 1887, rapidly became popular, but mules and horses were still working in some mines as late as the 1940s.
