THE PLANE-DROPPER. 



Fig. 5. 



39 



Velocities of soaring of single and double pairs of 15 x 4 inch inclined 



planes on the Plane-Dropper. 

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

 Ordinates : = Velocities in meters per second and feet per second. 



