In submitting the Fourth Volume of Turning and Mechanical Manipulation to the indulgence of the public, the Author respectfully begs leave to offer a few words upon this continuation, so constantly demanded by numerous friends and patrons, of his father's widely known and justly celebrated work.

It has always been the Author's earnest desire to produce the present volume, and force of circumstances alone has compelled postponement. A reference to the irreparable loss he sustained at a very early age, in the death of his highly gifted father, may be excused, as that loss obviously involved a long lapse of time for the attainment of adequate experience; with time, came the continued, active conduct of a business more than usually dependent upon close individual attention, no slight obstacle, while notwithstanding a statement in the preface to the first edition of the third volume, but withdrawn from subsequent editions, to the effect that a portion of the fourth was in print, all progress for the furtherance of the work made by his late father proved to have terminated with the third and posthumous volume.

A word of explanation is due to those who possess the edition referred to. The pages it was at one time proposed to utilize had been written for a smaller, and prior to the conception of the more extended work; subsequent and reliable judgment determined that they could not be in harmony with the published volumes, the idea was regretfully abandoned and the copies destroyed.

The Author recognizes the grave responsibility incurred in following the complete knowledge and able workmanship displayed in the preceding volumes, and is fully sensible of the comparisons, just and inevitable, his attempt must challenge. In writing the fourth volume, he has in the first instance followed the outline laid down for it in the general sketch of the contents of the complete work, absolutely; while in working out the detail of the wide range of subjects comprised in plain turning, he trusts that without neglect of or undue length in any, he may have succeeded in producing a companion volume not entirely unworthy of association with the first three, one also both elementary, and yet containing sufficiently advanced information, to render it acceptable to the amateur and others who follow the art of turning.

Information upon all matters spoken of in the first three volumes as deferred for consideration to the fourth, has it is hoped in every case been carefully given, and will be found on reference to the index. The Author trusts to receive lenient judgment for any shortcomings, and in order that they may receive future correction, he relies on the kindness of his readers to bring to his notice, ambiguous expressions, errors or omissions, from which, in spite of his exertions to the contrary, he can scarcely expect the fourth volume to be entirely free.

64, Charing Cross, London. 21st October, 1881.

The First, Second, and Third Volumes of this work, are written as accompanying books, and have one Index in common, so as to constitute a general and 'preliminary work, the addition to which of any of the other volumes, will render the subject complete for the three classes of Amateurs referred to in the Introductory Chapter.

A few additional copies of the Index for Vols. I, II., and III., have been printed for the convenience of those who may desire to bind an Index with every volume.