Note 26 — IX
J. Ellis Barker translation
The reference is to what are called "tracer" bullets. The hind end of the bullet contains a phosphorous mixture which leaves a trail of smoke and so indicates to the gunner where his bullets are going. If such a bullet penetrates a petrol tank or passes through escaping petrol—due to a perforated tank or a cut petrol-pipe—it sets the petrol on fire, but the prime reason is to trace the course of the shot. The Germans use similar bullets as largely as do the Allies.