30 



KXPEHIMENTS IN AERODYNAMICS. 



Table VI— May 25, 1889. 



To find the time of fall of different planes; flane-dropper statiouapj. 



S. P. Langley, Conducting experiments; F. W. Very, Assisting. 



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



Size of planes. 



One pair 12 x G inches (30.5 x 15.2 

 cm.). 



Weight (with dropping piece). 



(Grammes.) 



464 



22 



12 



One pair 18x4 inches (45.7 x 10.2 

 em.). 



4G4 



(Pounds.) 



Time of fall of 

 Angle with 4 feet (1.22 

 horizon. meters). 



(Seconds.) 



1.02 



1.02 



Pvcsult : The time of fall of both planes, at angles both of 0° and 45°, is, approximately, 0.55 



SGCOllds 



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



S. P. Langley, Conducting experiments; F. W. Very, Assisting. 



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



21.1° C; June 14, 26.1° C. 



