Might be a Bormann Shell Underplug
(1) to a small powder booster or magazine (2). This powder then exploded, sending the flame through a hole in the fuze underplug (5) to the powder chamber of the projectile. The purpose of the brass or iron fuze underplug was to form a solid base of support for the soft metal fuze, which could have easily been damaged during firing.
(1) to a small powder booster or magazine (2). This powder then exploded, sending the flame through a hole in the fuze underplug (5) to the powder chamber of the projectile. The purpose of the brass or iron fuze underplug was to form a solid base of support for the soft metal fuze, which could have easily been damaged during firing.