International Library of Technology: A Series of Textbooks for Persons Engaged in the Engineering Professions and Trades or for Those Who Desire Information Concerning Them; Fully Illustrated and Containing Numerous Practical Examples and Their Solutions;
Excerpt from International Library of Technology: A Series of Textbooks for Persons Engaged in the Engineering Professions and Trades or for Those Who Desire Information Concerning Them; Fully Illustrated and Containing Numerous Practical Examples and Their Solutions; Rock Boring, Rock Drilling, Explosiv Fig. 2 shows loose ground at the top of the hole. As this must be cased off before drilling can proceed, a drive pipe 18 forced through it for this purpose. Sometimes it is neces sary to case holes to a considerable depth, ...
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Excerpt from International Library of Technology: A Series of Textbooks for Persons Engaged in the Engineering Professions and Trades or for Those Who Desire Information Concerning Them; Fully Illustrated and Containing Numerous Practical Examples and Their Solutions; Rock Boring, Rock Drilling, Explosiv Fig. 2 shows loose ground at the top of the hole. As this must be cased off before drilling can proceed, a drive pipe 18 forced through it for this purpose. Sometimes it is neces sary to case holes to a considerable depth, or to stop up crevices, or to widen or ream out the hole, all of which oper ations, as well as the recovering of lost tools, enter into the subject, and need a more detailed description. For the pur pose Of explanation and detail, the American drill rig will be divided into the carpenter's rig and the drill rig. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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