88 THE NEW WORLD OF SCIENCE 



quickly or remain in action so long as the flash-ranging sections 

 whose equipment was lighter and could be more quickly set 

 up than that of the sound-rangers. 



Sound-ranging was a oroduct of the recent war. Whether 

 it will prove useful in furure wars is an open question but its 

 usefulness to the Allies in the recent war was beyond question 

 for, due to it, they possessed a marked advantage over their 

 enemy in being able to locate and silence hostile batteries under 

 conditions where all other means failed. 



