Postcard US-8386908

sent on
travel time 50 days
distance travelled 1,605 miles
received on
 Loading map...
postcard image of US-8386908
Shot Tower, Dubuque, Iowa The tower was built in 1856 to provide lead shot.
kalivoda, United States of America
kalivoda said:
posted 5 months 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!