First published in 1920. This study examines the science of industrial work and the advances in its application to the economic life of the community. The author commences this volume with a brief explanation of the general principles of Theoretical Mechanics which have been applied in the study of the Human Motor. Space has also been devoted to the explanation of the laws of thermo-dynamics and of the Conservation of Energy. These provide the reader with the means by which muscular work and fatigue can be measured. This title will be of interest to students of economics and business.