PS31 John Ericsson invented the USS Monitor. It was made of iron and had a steam engine. It had two guns inside a revolving turret that let it shoot in any direction. It was built in Greenpoint.

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John Ericsson invented the USS Monitor. It was made of iron and had a steam engine. It had two guns inside a revolving turret that let it shoot in any direction. It was built in Greenpoint.

John Ericsson invented the USS Monitor. It was made of iron and had a steam engine. It had two guns inside a revolving turret that let it shoot in any direction. It was built in Greenpoint.

4 of 26