Excerpt from Handbook of Mining Details In the editing of this volume, the work has been chiefly in the selection of the material and its arrangement in chapters. Now and then it has been possible to excise some paragraphs as being unessential and occasionally the phraseology of some articles has been altered a little, the requirements of preparation for the original weekly publication not always having permitted leisurely considera tion, but in the main the articles now presented in this book are as they were given in the pages of the Engineering and Mining Journal. However, it has been necessary in a few cases to reduce the size of the engravings. In making this collection the limitation of space necessitated the rejection of all material that did not pertain to the subjects selected for the chapters Of the book, and even so it was necessary to dismiss some of the longer articles pertaining to them, which approached the character of essays rather than being the description and discussion of details. Of course a wealth of contributions pertaining to the arts of ore dressing and metallurgy had to be rejected sum marily. The compilation covers the publications in the Engineering and Mining Journal from Aug. 7, 1909, to July 1, 1912. If all of the material that appeared in this department of the Journal during that period of three years had been used it would have been necessary to make a book of several times the size of this. NO claim is made that this book is a treatise, exhausting its subject, or any part of it. It is simply a handbook that is a more or less random collection of useful information, being just what passes through the pages of the Engineering and Mining Journal in the course of a few years. NO special attempt to round out any subject has been made. Yet it will be found that some subjects are fully treated. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com 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.