The following pages are not, strictly speaking, a mere reprint from the "English Mechanic." The papers have been carefully revised and re-arranged; some statements, the correctness of which appeared doubtful, modified or wholly withdrawn; while, in one or two instances, whole chapters have been re-written, and the suggestions and inventions relating to the Lathe, furnished by other correspondents, embodied (when they appeared of real value) in the work.

But, in addition, a valuable Appendix is now published, containing matter of great importance, contributed by one or two gentlemen, who most kindly placed their papers at the service of the author. Foremost among them stands a paper on the angles of tools, by Dodsworth Haydon, Esq., of Guildford. A clever arrangement of Lathe for Rose Engine Work, by the aid of the Eccentric Chuck without Rosettes, is also added from the pen of Mr. Elias Taylor, of Brighton; and one or two matters, which did not appear so fully treated as they deserved in the body of the work, have been resumed and more fully discussed in the Appendix.

The author gratefully acknowledges the suggestions of various correspondents, amateurs and working men, from whom, as a rule, he has not failed to obtain any required assistance.

That the work, in its present form, is entirely satisfactory or complete, the writer cannot pretend; that many errors have crept in is highly probable; but, if it is acknowledged to be the best work yet produced on the Lathe, and should prove in any degree serviceable to amateur or artisan in the pursuit of this most delightful art—aye, if it should stir up some abler pen to write a better and more complete series, it will afford real pleasure and lasting gratification to

THE AUTHOR.

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