shot tower

[rekha patel]

tower of a kind once used to make shot; molten lead was poured through a sieve and dropped into water

[Vania]

A shot tower is a tower designed for the production of small-diameter shot balls by free fall of molten lead, which is then caught in a water basin. The shot is primarily used for projectiles in shotguns, and for ballast, radiation shielding, and other applications for which small lead balls are useful.

[argey]

A tall building in which droplets of molten lead fall into a pool of water in order to form lead shot