This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 edition. Excerpt: ...compressed air and horse-power of the perforator.--First, for the percussion-cylinder. Taking an average length of stroke of 8 inches, with an area of piston of 7-068 square inches, the net volume of air consumed per stroke, supposing that the air was admitted for the whole of the stroke, was(7-068 x 8 ...

Practical Tunnelling 2017, Andesite Press

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Practical Tunnelling 2010, Nabu Press, Charleston SC

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