THE ELEMENTS OF MACHINE-DESIGN.

An Introduction to the Principles which determine the Arrangement and Proportions of the Parts of Machines, and a Collection of Rules for Machine-Design. By W. Cawthorne Unwin. 1 vol., 12mo. Illustrated. $1.50.

“No labor has been spared in condensing into the smallest compass the information at the author’s disposal, and in endeavoring to render the treatment of the subject simple and clear. If the student’s path has in any degree been rendered easy, it is because a good deal of labor has been expended on the roadway.”—Extract from Preface.