shot tower

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A tower formerly used for making shot for firearms, at the top of which molten lead was poured through a sieve and allowed to fall into a vat of water at the bottom.

from The Century Dictionary.

• noun A high round tower in which small shot are made by dropping molten lead from the top. See shot, n., 3.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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