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Triumphs and wonders of the 19th century, the true mirror of a phenomenal era, a volume of original, entertaining and instructive historic and descriptive writings, showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress .. (1899)

Boyd, James Penny, 1836-1910 · Philadelphia, Pa., A. J. Holman & Co · leaf 616

An illustration from Triumphs and wonders of the 19th century, the true mirror of a phenomenal era, a volume of original, entertaining and instructive historic and descriptive writings, showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress .., 1899, leaf 616
method obviates the use of timber for holding upthe surface. After the overlying gravel is removed, should the conditions be favorable,the ore is taken out with a shovel. If this cannot be done, some methoddepending on rock-filling is adopted. At the Auburn mine, after strippingand driving the… … 584 TRIUMPHS AND WONDERS OE. THE XIXth CENTURY cones, having their bases at the surface. Additional raises are then madehalfway between the others, and the remaining material extracted. At the Fayal mine they take out rooms twenty-four feet wide by threehundred feet long, with a twenty-four-foot…

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