The fuze protrudes into the cylindrical cavity of the smoke mixture and is staked to the base of the projectile.
British Dictionary definitions for fuze
fuse1
/fjuːz/
noun
1.
a lead of combustible black powder in a waterproof covering (safety fuse), or a lead containing an explosive (detonating fuse), used to fire an explosive charge
2.
any device by which an explosive charge is ignited