Structure and Flight 



remaining stationary. An equilibrium of forces 

 has to be maintained and so the area of wing 

 exposed has to be regulated according to the 

 strength of the wind. The wings must strike 

 the air with sufficient force to resist gravity, and 

 the resulting forward movement has to be neu- 

 tralised by the angle at which the body is inclined. 

 The forward movement is, in other words, made 

 to act upwards against and with the wing-beat in 

 resistance to gravitation. 



This most accomplished aeronaut is constantly 

 to be seen performing this feat of hovering over 

 many an English field, and despite the severe, 

 though unmerited, treatment he receives at the 

 hands of many a gamekeeper, long may he 

 continue to do. 



II 



