Mepụta ụdị nke ahịrịokwu a dị mgbagwoju anya Ericsson mere USS'' Monitor'na 1861.
N'ezie, ụdị nkebi ahịrịokwu ahụ dị mgbagwoju anya bụ "Ericsson mere USS''Monitor' n'afọ 1861, ihe kachasị pụta ìhè ya bụ nnukwu ụlọ elu nke nnukwu cylindrical nke arụnyere n'etiti etiti ụgbọ ahụ n'elu elu elu ala, nke a na-akpọkwa'' raft''. "