64 



EXPERIMENTS IX AERODYNAMICS. 

 Fig. 11. 



Horizontal pressure (or resistance to advance) on 30x4.8 inch plane at soaring speed 



obtained « ith the O P wn Recorder. 



Abscisssse: Angles of inclination («) of plane to horizon. 

 Ordinates: Horizontal pressure I B) in grammes. 

 O Represents points obsen i d 

 x Represents points given by equation, R = weight X tangent a. 



