THE PLANE-DROPPER. 

 Fig. 5. 



39 



19.811 65 



C© 



Single pa ir of plane*. . 

 Double 



-f, 'f/erenct 



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



planes on the Plane- Dropper. 

 Abscissa? : = Angles of inclination («) of piano to horizon. 

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



