468 



reille: anti-aircraft firing 



II 



(a) A point in space taken as a target for a given gun is de- 

 fined by: 



(1) The azimuth in which it is located. 



r 



Trajectorial Surface f 

 IsochronicalSuTrfafrC 

 Azimuthal Surface SI 



Fig. 2. 



(2) The trajectory on which it is located in this azimuth, this 

 trajectory being itself defined for the given gun by the angle of 

 departure. 



(3) The setting of the fuse which on the said trajectory wiU 

 determine the burst at the said point. 



