John Henry Barr

Elements of Machine Design John Henry Barr

Elements of MACHINE DESIGN by DEXTER KIMBALL AND JOHN BARR. Originally published in 1909. Preface: THIS book presupposes a knowledge of Mechanism and Mechanics of Engineering. With the mechanism determined, the remainder of the work of designing a machine consists of two distinct parts: a) Consideration of the energy changes in the machine, and the maximum forces resulting therefrom. b) Proportioning the various parts to withstand these forces. A thorough understanding of these gencraI principles is essential to successful design. A very brief discussion of typical energy and force problems is given in Chapter 11. The general principles of lubrication and efficiency are discussed in Chapter IV. Both of these are of prime importance to the engineer and while the discussion is necessarily brief it is believed that the fundamental principles are fully covered. The remainder of the book is devoted to the discussion of some of the more important machine details, with a view of showing how the theoretical considerations and equations discussed in the first part of the work are applied and modified in practice. The treatise is, in no sense, a hand-book, neither is it a manual for the drafting room, but is a discussion of the fundamental principles of design, and only such practical data have been collected as are needed to verify or modify logical theory. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.