Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.

This is another classic contribution by Braune and Fischer to the field of biomechanics. The pendulum method was employed to ascertain ac curately the moments and radii of inertia of the human body and its different parts about all axes - transverse, oblique or longitudinal. This elegant method is described in detail, together with the results. Relations were found between the centres of inertia on one hand and the lengths and diameters of the body segments on the other. These data were originally prepared for the authors' later work, The Human Gait, to determine the forces exerted on and by the parts of the body during walking. Such work is the basis for solving the mechanical prob lems related to any movement of the human body: thus, the original results presented here continue to be of im mense value to current research and practice. Aywaille, May 1988 P. Maquet v Contents Introduction . . . . . . . . . . . . . . 1 Experimental Determination of the Moments of Inertia of the Parts of the Body About Axes Through the Centre of Gravity and at Right Angles to the Longitudinal Axis, and About the Longitudinal Axis Itself . . . . 11 First Series of Experiments. . . . . 16 Second Series of Experiments. . . . 25 Oscillations of the Trunk and Head System. 29 Oscillations of the Trunk Without the Head 30 Oscillations of the Head. . . 31 Oscillations of the Left Leg. . . . . . . . 31 Oscillations of the Left Thigh. . . . . . . 31 Oscillations of the Left Lower Leg and Foot System . . . . . . . . . . . . 32 Oscillations of the Left Lower Leg . . ."

The different chapters of the present book were published separately each as a complete entity in the Proceedings of the Royal Saxon Society for Sciences. Chapter 1 appeared in 1895 under the names of Wilhelm Braune and Otto Fischer although Braune died immediately after the initial experiments, before the recordings had been interpreted. Chapters 2-6 were signed by Fischer only and appeared in 1899, 1900, 1901, 1903 and 1904. Basic data needed for this investigation of the human gait had been provided previously. A research on the centre of gravity ofthe human body and its different segments by both authors was published in 1889, determination of the moments of inertia of the human body and its segments in 1892. So far only the fIrst of these two works has been published in English. The other has been translated and awaits publication. Springer-Verlag must be congratulated for the quality of this edition and for the care they took in reproducing the original fIgures. This was certainly no easy task. We thank them for the patience they displayed towards the translators. Publication of the present book was made possible fInancially by Prof. M. Muller, Bern. We are grateful to him for his generosity and so will be the scientifIc community.