. Animal mechanism: a treatise on terrestrial and aërial locomotion. Animal locomotion; Flight. Fig. obtained with the win^ of a bee, oscillating in a plane which is sensibly tangential to the generatrix of the registering cylinders. This form, which theory enables us to predict, is always produced when the plane in which the wing moves is tan- gential to the generatrix of the cylinder. But in examining these tracings we easily recognise changes in the thickness of the stroke—parts which appear to have been made by a greater or less friction of the wing on the cylin- der ; we here
. Animal mechanism: a treatise on terrestrial and aërial locomotion. Animal locomotion; Flight. Fig. obtained with the win^ of a bee, oscillating in a plane which is sensibly tangential to the generatrix of the registering cylinders. This form, which theory enables us to predict, is always produced when the plane in which the wing moves is tan- gential to the generatrix of the cylinder. But in examining these tracings we easily recognise changes in the thickness of the stroke—parts which appear to have been made by a greater or less friction of the wing on the cylin- der ; we here find a new and certain proof of the existence of a movement in the form of an 8, as we now propose to show by a synthetic method. Let us take a Wheatstone's rod tuned to the octave ; let us fix on it the wing of an insect as a style, and let us trace the vibra- tions which it executes. We shall obtain, if the cylinder be motionless, figures of 8 when the wing touches the paper by its point applied perpendicularly to its surface; and if the cylinder revolve, we shall have lengthened figures of 8. We may obtain, with a rod tuned to the octave, tracings identical with those given by the insect; of which a proof is afforded by the comparison of the two following figures :—. Fig. 78.—Tracings of a wasp ; the insect is held so that its wing touches the cylinder by its point, and traces especially the upper loop of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marey, Etienne-Jules, 1830-1904. New York, D. Appleton and co.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectflight, bookyear1874
