Clipart tagged: ‘Helicopter Model’

"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

Screw-Model

"In 1872 Penaud discarded the rigid screws in favour of elastic ones...Penaud also india-rbber under…

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