reille: anti-aircraft firing 



mi. 



In the same manner there was at first transferred to the 

 sphere of firing against aerial targets the general principles of 

 ranging (jump, bracket, etc.), which were in use in firing against 

 terrestrial targets. 



Finally, when it was a question not of firing at balloons, but 

 at flying machines, not of firing at fixed objects but at objects 

 in motion, it was first thought that the methods of firing should 

 be similar to those employed against marching troops, against 

 a train, etc. 



Fig. 1. 



From this came the method of ranging called ''de la tenaille" 

 and others of the same kind. From this came, too, the consid- 

 erable efforts made to employ the range finder and to make use 

 of the data obtained through this instrument (that is to say, the 

 actual distance of the target) in order to determine the fuse 

 setting. 



Gradually, experience having demonstrated that this very 

 simple method of transposing into the ballistic problems of space 

 solutions which were only appropriate to the ballistic problems' 

 of terrain, only led to decided errors and to notorious ing^- 

 ciency, the following general ideas were reached: 



