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The practice of applying to books for information concerning their work, is rapidly spreading among the engineers and mechanics of this school-spangled country; and this book is published in the hope that its pages may furnish a share of the needed assistance. Those men, who, Socrates-like, search for knowledge from the recorded experience of others, are the men, who, in the near future, will take leading places in our march of national progress. To such men, who are earnestly toiling up the steep grade of Self-help, this book is respectfully dedicated.
Angus Sinclair.
New York City,
Jan. 1, 1885.
PREFACE TO THE THIRD EDITION.
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I desire to thank the railroad world and the technical press for the kind reception they have extended to my book. The necessity for publishing the third edition within three months after the first one was issued, indicates that the book was wanted.
In the present edition I have corrected a few errors, and made some necessary alterations, that will add to the value of the book.