46 



EXPERIMENTS IN AERODYNAMICS. 



Fig. '7. 



TTTl 



Times of falling 4 feet of single and (lou1:)le pairs of 15 x 4 incli i^lanes set at different angles of 



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

 Abscissae : = Angles of inclination («) of plane to horizon. 

 Ordinates : = Time of fall in seconds. 



