Postcard US-8386908
Loading map...
Shot Tower, Dubuque, Iowa
The tower was built in 1856 to provide lead shot. |
|
kalivoda said:
posted over 1 year ago
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. |
|
You need to sign in to leave a comment! |