. Scientific American Volume 84 Number 05 (February 1901) . THE LATE PROF. ELISHA GRAY. up and down, which has the effect of raising it in avertical direction, and then between the beats it glidesforward, and the constant repetition of this actionproduces forward flight. In the smaller quick-flyingbirds these movements are scarcely discernible, ow.ngto the rapidity with which the wings are flapped, butwith the heavier and larger birds, such as the alba-tross and gull, the movements are perfectly distin-guishable.The result of these investigations convinced Mr. Dav-. FLAN VIEW OF FLYING MACHINE
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. Scientific American Volume 84 Number 05 (February 1901) . THE LATE PROF. ELISHA GRAY. up and down, which has the effect of raising it in avertical direction, and then between the beats it glidesforward, and the constant repetition of this actionproduces forward flight. In the smaller quick-flyingbirds these movements are scarcely discernible, ow.ngto the rapidity with which the wings are flapped, butwith the heavier and larger birds, such as the alba-tross and gull, the movements are perfectly distin-guishable.The result of these investigations convinced Mr. Dav-. FLAN VIEW OF FLYING MACHINE. A NEW FLYINGMACHINE. An ingenious flyingmachine has recentlybeen designed by aScotchman, Mr. G. L.O. Davidson, of Inch-tnarlo, Scotland. Mr. Davidson hasbased his machine uponthe principle of theflight of Ihe bird. Inflying, a bird does notpropel itself throughthe air, but glides for-ward by opposing theresistance of its wingsurface to the air. Itwill be recollected thatboth Lilienthal and Pil-cher adopted this the-ory in their respectivemachines, and were em-inently successful in