Excerpt from Rock Drills: Design, Construction, and Use
In presenting this collection of essays on rock drills, I make no claim to have treated the subjects exhaustively. Rock drills have formed the subject of numerous articles in the technical press. Various authors have dealt with the subject; but only incidentally and as a branch of other subjects. I know of no book that will, in the first place, give a description of the leading modem makes of English, Australian, and American drills of both piston and hammer types, or give such details of their actual use in metalliferous mines as would enable a novice to approach them with some previous knowledge; and, at the same time, assist the engineer and mine manager to choose machines most suited to his particular needs and to maintain and work them at their highest efficiency. This is my excuse for attempting such a task, while engaged in other mining work.
I have not hesitated to reprint much of the writing of others, always, I hope, with due acknowledgment. Where the facts were stated concisely and clearly I saw no object in transcribing. I had much help from H. P. Gillette's excellent book, C. LeNeve Foster's and other works on mining. I have borrowed largely from proceedings of scientific societies and from A. and Z. Daw's exhaustive work on Blasting Rock. Many thanks are due to manufacturers for much help. I have tried to write without bias in comparing the merits of various machines and devices, and the book is not an advertisement for any particular drill.
I have not given much space to either rotary or gasoline drills as they scarcely come within the scope of the book.
My apology to my critics, who will doubtless find many omissions in the book, is, that it is a collection of notes that the author himself would have been very pleased to have had in book form when recently selecting and working rock drills. My chief qualification for writing this book is, that I have had to earn my living by using many of the machines described, and more recently in superintending rock-drilling operations.
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