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Both the industrial and the commercial revolutions hinged on coal and iron and the power to transport them. As soon as Great Britain, after experimenting with water as power in the eighteenth century, began to organise her industry along the lines of steam in the nineteenth, new possibilities arose. Steam as a motive power never dries up like water, is never in flood, is never frozen ; i t only requires a small amount of coal and water and it can be used as a tireless force economizing labour and supplementing man's puny hauling and lifting powers, and those of his tamed animals. It is also transferable to a far greater extent than water power.