Description
The proper nomenclature for the tracer assembly is “Tracer and Igniter, Shell, No. 12, Mk. I/L/ Internal,” the British designation. The assembly is contained in a steel shell which threads into the base of the projectile so that only a paper disc separates the T-shaped relay igniter charge of loose black powder from the black powder pellet in the bursting charge. This relay igniter is surrounded by tracer composition which extends rearward to a layer of priming composition. Between the priming composition and the cap holder which fits inside a stirrup spring is loose black powder. The cap holder assembly includes a cap anvil which fits over a vent leading to the loose black powder and igniter composition placed between the anvil and the stirrup spring. The stirrup spring rests on the shoulders of a cylindrically shaped anvil which is closed at the bottom. A protrusion in the bottom of the anvil acts much the same as a firing pin. The tracer and igniter assembly is sealed at the base with a lead sealing disc.
Functioning
No information about functioning.
See Also
Nothing else to see.
Source(s)
TM 9-1904, Ammunition Inspection Guide (1944)
