Tracer bullet

Definition and stakes

Portrait of Benedict Crowell Benedict Crowell,  America's Munitions 1917-1918

“ The tracer bullet which we manufactured contained a mixture of barium peroxide and magnesium and in flight burned with the intensity of a calcium light. These bullets were principally used by machine gunners of aircraft, since in the air it is impossible to tell where machine-gun projectiles are going unless there is some device enabling the gunner to see the trajectory of the bullets. This is done by inserting tracer bullets at intervals in the belts of cartridges fed into the machine gun. The common conception of a tracer bullet is one that leaves a trace of smoke in its flight ”
Source: Gutenberg

Boyd Cable,  Air Men o' War

“ They continued their "giddy-go-round," and a dozen of the Huns at top speed, with engines full out and machine-guns rattling and ripping out a storm of tracer bullets in streaking pencil-lines of flame and blue smoke, came hurtling down like live thunderbolts. The sight alone might well have been a terrifying one to the Fo-Fum men, and the sharp, whip-like smacks and cracks about them of the explosive bullets which began to find their mark on fabric or frame would also have been upsetting to any but the steadiest nerves. ”
Source: Gutenberg

Get perspective with Kwize: daily news enlightened by great literature