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THE THIED EDITION.
Although the work of the millwright, or the art of constructing the machinery of transmission in mills—considered separately from the machines employed in the manufacture— does not in the present stage of progress admit of much improvement, it has nevertheless undergone very considerable changes both in form and character. It is no longer of that heavy ponderous character which existed sixty years ago. The velocities of both shafts and wheels have been trebled, and in most cases quadrupled, and from this a saving of two-thirds in weight, and a proportionate saving of power, have been effected. All these facts are carefully recorded in the present volumes; and, taking into account the improvements in water-wheels, the investigation of steam as a motive power, and other practical instructions for the guidance of the millwright, I have no hesitation in recommending their careful perusal to the professional and the general reader.
Manchester: April 27, 1871.
THE SECOND EDITION.
The early demand for a Second Edition of my Treatise on Mills and Millwork, has enabled me to correct errors and supply omissions, which are almost sure to escape notice when the Author's time is occupied in professional pursuits.
The history of Mills is a subject which might be greatly extended; but the main object I have in view is to lay before the reader the results of a successful practice as a Millwright and Engineer during a period of more than half a century—a period which has contributed more than any previous one to the development and perfection of the manufacturing industry of the world.
Manchester: June 26, 1861.