Tracer rounds are commonly used by armies who want to redirect their small arms fire more precisely at a target.
One difficulty is that, by letting off a burst of brightly-lit bullets, it’s easy for an enemy to identify their source and return fire.
Today’s invention is a bullet which has a rear-facing skirt, within which an insulated metal plug sits (red).
This would be heated by the firing process so that its flight could be followed by the shooter, using infra-red goggles, but without being visible to an enemy.
