« ΠροηγούμενηΣυνέχεια »
In introducing this small work to the notice of the public, the Author has merely to state that it was undertaken with a view to facilitate the calculations of Millwrights, Engineers, Iron-founders, &c. and by them it is to be hoped it will be duly appreciated, more especially when they consider that the subjects treated of (with very few exceptions) have been diffused throughout a number of valuable and extensive works quite out of the reach of mechanics in general, and too voluminous to be made useful where they were most required. Indeed, the greater part of mechanical works have been swelled out by theoretical problems, too tedious for practical men ; a defect which is here obviated, by commencing with a system of decimals, and carrying on the work throughout entirely on that system.
With regard to the subjects selected, no comment is necessary, as every mechanic is well aware that one or other of them is required daily ; and the reader will find the book, though small, to be interspersed with various original and useful rules, well adapted for mechanical calculations.
Liverpool, July, 1832.
TO THE SECOND EDITION.
It is undoubtedly a source of gratification to an author, to find that his labours have been duly appreciated by a discerning public ; and this, it may be inferred, has been the case with the Author of the “ Millwright and Engineers’ Pocket Companion,” the first edition of the work having been disposed of in little more than twelve months; and a second edition being called for, he has been induced carefully to revise it, and greatly augment it with other useful matter ;-among which will be found Tables of Square and Cube Roots, Strength of Materials, Tables of the Circumferences and Areas of Circles, &c.—hence, it is anticipated, that these improvements, combined with the former practical rules which it contains, will render it a still more useful companion to Mechanics, and men of business in general.
Liverpool, Sept. 1833.