Shot Tower
Shot Tower located in Dubuque, Iowa, is one of the last remaining shot towers in the United States. The tower was built in 1856 to provide lead shot for the military. The invention of the shot tower enabled economical production of many nearly perfect lead spheres of the right size to fit in a musket. To make the shot, molten lead was poured through a grate at the top of the tower. The droplets that fell from the grate were of relatively uniform size, and the fall provided enough time for the liquid-metal droplet to form into a sphere before landing in the water below. The water cooled the lead to its solid state, retaining the spherical shape. -from Wikipedia
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