Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 18
le balloon, sometimes termed simply adirigible, usually has its gas envelope elongated inform. It is fitted with motive power to propel it, INTRODUCTORY, 17 and steering mechanism to guide it. It is distinct-ively the airship. Aeroplanes are those forms of flying machineswhich depend for their… … A biplane glider Aeroplanes exist in several types: the monoplane,with one spread of surface; the biplane, with twospreads, one above the other; the triplane, with threespreads, or decks; the multiplane, with more thanthree.2 18 INTRODUCTORY. The tetrahedral plane is a structure of many smallcells…
Aeronautics
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