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Screw-Model
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Description: "In 1872 Penaud discarded the rigid screws in favour of elastic ones...Penaud also india-rbber under torsion for the whale-bone and clock springs of the smaller model is remarkable for its lightness, simplicity and power." -Britannica, 1910
Source: Encyclopaedia Britannica (11th ed., vol. 10) (New York: The Encyclopaedia Britannica Company, 1910) 10:514
Keywords: Screw Model, Helicopter Model, Penaud
Copyright: 2009, Florida Center for Instructional Technology. See license.
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