Publisher's Synopsis
Excerpt from The Uses of Compressed Air: With Illustrations
The most important application of compressed air in the past has been that to rock drills in tunnels and mines, and in both these fields of activity the drill has accomplished wonders within a decade. America can claim, at Hoosac Tunnel, the first general application of the rock drill, followed by the work at Hell Gate, and in all the tunnels of the Alps, and in our own and other countries. The New York Aqueduct, 30 miles in length, was made with such remarkable speed only by the use of compressed air driving the rock borers. Another instance of rapid tunnelling by the use of compressed air is cited in the work at Niagara Falls, where 50 feet of tunnel was excavated in the short space of six months, and it is to be observed that, in locations permitting the use of shafts at frequent intervals, a tunnel ten miles in length can be constructed as quickly as that of one mile.
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