Statistics for occurrence #1 of “Capt. Ericsson” in chapter 22 of Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 4.:

...will equal them in destructive power. They will burrow under an enemy's works, and when they explode they produce an effect in the vicinity like an earthquake. The Government has also ordered for Capt. Ericsson some wrought-iron shot, very handsomely turned. The engines have been placed in the vessel for some time. They were laid two months and eight days from the time of laying the keel. They work ...
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