46 



EXPERIMENTS IN AERODYNAMICS. 



Fig. 7. 



Times of falling I feel oi single and double pairs of 15 x 4 inch planes set at different angles of 



elevation and having a horizontal velocity of 23.5 meters per second. 

 Abscissa?: = Angles of inclination (a) of plane to horizon. 

 Ordinates : = Time of fall in seconds. 



