Aircraft

X X   X X   Extracts   X X   X X

Full Text of the Document

X X   X X   Extracts   X X   X X

....gliders and flying machines. Further, Encyclopedia Britannica (Macropaedia) Vol. I describe the "aircraft" in broad two categories which are defined as under:- "All aircraft fall into two general categories - lighter-than- air or hearvier-than-air. Several distinct types are recognized within each group. Each may perform a variety of missions calling for modifications for special....