Elastic Aerial Screw with Twisted Blades Resembling Wings
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An illustration of a elastic aerial screw with twisted blades. “X, End of driving shaft; v,w, Sockets in which the roots of the blades of the screw rotate, the degree of rotation being limited by steel springs (z, s); ab, ef, Tapering elastic rods forming anterior or thick margins of blades of screw; d c, h g, Posterior or thin elastic margins of blades of screw. The arrows m, n, o, p, q, r, indicate the direction of travel.” -Britannica, 1910
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Miscellaneous Bird IllustrationsSource
Encyclopaedia Britannica (11th ed., vol. 10) (New York, NY: The Encyclopaedia Britannica Company, 1910)
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