Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 342
le success, owing largely to the heavyand complicated mechanism required. Thesemachines are called ornithopters or bird-winged, and although they still have many ad-vocates, are now regarded merely as curiosities.But just as land vehicles use wheels instead offeet and as boats use propellers… … EARLY WRIGHT MACHINE IN FLIGHT ATFORT MYER, VIRGINIA. water or as the radial cutting-edges of a twist-drill cut their way through a piece of wood. When the screw pulls the aeroplane from thefront, it should be called a tractor-screw, andwhen it pushes from the rear, it should be calleda…
Children's literature
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