雅各布-德根 1808 年设计的带有襟翼阀的鸟式飞行器,飞行员站在一个刚性框架上,用一根可移动的水平杆操纵机翼,选自《Les Merveilles de la Science》,约 1870 年出版(石版)。(Jacob Degen's 1808 ornithopter with flap valves, in which the pilot stood on a rigid frame and worked the wings with a movable horizontal bar, from 'Les Merveilles de la Science', published c.1870 (litho))法语学校 |
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日期不详 · lithograph
· 图片ID: 1492787
Private Collection / Bridgeman Images |
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