The Bookshelf for boys and girls Book of Wonders and Curious Things (1912)
University Society, New York · New York: University Society · leaf 174
nventor began his lessons in flying,taking careful notes of the machines behaviorat different rates of speed. It was soon provedthat when three quarters of the power was used,three of the car-wheels left the lower track, and at full speed the whole machine ran onthe upper track, free from the… … By permission, fn>i Ueber Laud und Mcer. WARFARE IN THE AIR, AS IMAGINED BY A GERMAN ARTIST, *59 160 FLYING-MACHINES AND AIR-SHIPS
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