rikes them tangentially from above, but are from M. Bertelli's mechanical demonstration that Na- resistance upon the air possessed by the concave wing— 'afiied in their elevation. ture has endowed birds with concavo-convex or, better, an efficiency first established by Leonardo da Vinci and The… … or in the concavity of the wing. The third apparatus (Figs. 10 and 11) is similar in Discharging: Brick from the Kiln. purpose to the preceding. This time the wing is se- cured horizontally to a light quadrangular support, supporting surface, that is to say, beneath and above sustains itself and…
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