PS 196 John Ericsson invented the USS Monitor which was made of iron and used steam power. It was built in Greennpoint. It had two guns in its turret which turned and allowed the USS Monitor to shoot in all directions.

PS 196

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John Ericsson invented the USS Monitor which was made of iron and used steam power. It was built in Greennpoint. It had two guns in its turret which turned and allowed the USS Monitor to shoot in all directions.

7 of 37