aircraft aircraft catapult allegheny observatory astronomer astronomy aviation bolometer boston latin school charles doolittle walcott control theory dihedral engineer frank washington very glenn curtiss glider greenhouse effect harvard college observatory henry draper medal internal combustion engine inventor langley air force base langley research center liberty ship manley-balzer engine mount langley nasa octave chanute physicist potomac river smithsonian astrophysical observatory smithsonian institution spencer fullerton baird steam engine sun svante arrhenius test pilot united states united states department of war united states national academy of sciences united states naval academy university of pittsburgh wind tunnel wing world war ii wright brothers