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Coal mining. Illustration of two boys hauling coal in a wheeled wicker basket in a mine. The only source of light is a candle placed on the trolley. The use of trolley boys or "putters" was continued in low-roofed shafts even after the introduction of ponies. Underground haulage of coal is now performed by mechanical means. Image taken from Mines and Miners; or Underground Life by H. Bristow in 1869.
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