OCR Text |
Show mi ' LOCATING GUNFIRE il' t)no of the most interesting phases M of war science la locating the enemy's H- latteries. The situation of these is Kv constantly shifting. The guns are i," ' so camouflaged with , foliage and painted substances that they cannot v always be placed by air observers or .jf aerial photography. mf. When a new gun lifts up its voice ' from some unknown location and bc- M''l- gins "straftlng" our boys, the tech- v ntcal men begin to observo the Bpv; ' nound waves resulting from the orlg- B'f lnal discharge. A station located fH. nearest tho front line will get the f explosion first. Then by comparing : the exact Instant when It was hoard, with tho instant whon a receiving ! , etdtlon ln tho rear cots it, nnd fig. - uring upon the relative distanco of tthe two stations, tho speed with , which sound Is traveling at that par- t ( ticular time can bo precisely doter- Hkt ' mined. '. ' o , The speed of sound varies with Hkffe . ,vlnd and condition of atmosphere. kv '"' , After this speed is determined, tho :' distance of that gun can bo closely WL?. estimated. That of courso docs not show direction. That Is to bo had H .only, by observations from a .number H; 'of sound receiving stations, '''' "iTheu tho distance Is figured' from Bx. v ')' - ' " ' ''" " u'' |