30 



EXPERIMENTS IN AERODYNAMICS. 



Table VI— May 25, 1889. 



To find th Unit of fall of different planes; plane-dropper statioua;y. 



S. P. Langley, Conducting i cperiments; F. W. Very, Assisting. 



! urometer, 731.5 mm. ; temperature, 17°.5 C. ; wind, light. 



Sizi of planes. 



Weight (with dropping piece). 



i < rrammes.) 



One pair 12 x 6 inches i 30.5 \ 15.2 



cm.). 



I'll 



12 



3^= 



1 12 



One pair 18x4 inches (45.7x10.2 

 cm.). 



4G4 



(Pounds.) 



Time of tall of 

 Angle with 4 feet 1 1.22 

 horizon. meters). 



1.02 



l.<)2 



Result : The time of fall of both planes, at angles both of 0° and 4~>°. is. approximately. 0.55 



ids. 



Table VII— June 10, 11, 12. and 14. 1889. 



S. P. Langley', Conducting experiments; F. \\ . Very, Assisting. 



Mean barometer, 734.0 mm.; mean temperature, June 10, 26.6° C. ; June 11, 17.8° C. ; -Tune 12. 



21.1° C; June II. 26.1' C. 



