Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 251
r the glider. It does steadythe machine, however, and is very important in pre-serving the equilibrium when in flight. It is formedof two small planes intersecting each other at rightangles and covered on both sides with the cloth, thesections covering the vertical part being cut along 250 THE… … Lilienthal in his double-deck glider. It proved unmanageable and fell, causinghis death. The hill is an artificial one built for his own use in experimenting. plane, and the other from the lower. The whole con-struction is steadied by guys of the piano wire. All wooden parts should be smoothed off…
Aeronautics
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