Chapter I describes a wing launching device and the installation designed to photograph the trajectories.nIn chapter II these trajectories are studied with respect to the enveloping surface of a diametrical plane of a hypothetical cylinder which rolls and slides along an inclined plane.nChapter III analyzes the process according to which a couple maintaining a steady motion of uniform rotation indefinitely is set up in the motion of the system about its center of gravity.nIn chapter IV the elements of the steady motion are determined experimentally as functions of the wing characteristics (wing loading, span, chord). Moreover, these elements are not rigorously constant tut periodic;their variations during one period are treated in chapter V.nThe study of rapid rotations is given in chapter VI.nChapter VII contains a description of the different modes of launching, particularly of launching at a speed of rotation superior to the speed of steady motion.nChapter VIII confirms the preceding results on rotors with three or four half-paddles, angularly equidistant, forming paddle wheels or prisms.nElastic tending, an obstacle to the study of excessively elongated wings, is contemplated in chapter IX. This study resulted in the experiments with cylindrical wings, described in chapter I.nChapter XI evidences the high stability of the steady motion of fall with the accompanying oscillations.nThe helicoidal fall of isosceles trapezoids and, in particular, an unexpected steady motion of fall, which are tied to the data of chapter IV, are discussed in chapter XII.nChapter XIII deals with the rotation of graphite flakes in the flame of a Bunsen burner and in a vertical air current.nChapter XIV concerns the fall in water.nThis work, which resulted from the study of about 1800 photographs, was carried on under the direction of Z. Carriere.
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