The Bookshelf for boys and girls Book of Wonders and Curious Things (1912)
University Society, New York · New York: University Society · leaf 171
uconveniently can. Now stand on a chair anddrop the bird, and it will come down as if it werea hawk after a chick. The weight of the pinspulls it down, the wings resist by pressure againstthe air, and the paper bird slides down insteadof falling direct. When the wings are sloped a little upward… … PENAUD S AEROPLANE MODEL. The little wings at the rear are set at a greaterangle than the large wings; and whenever thefront begins to droop, they resist more, andthus bring the head upward again. They do thisthe more easily because the front wings lose somepower whenever they are nearer level. A…
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