Army engineer who designed and built the ironclad Monitor for the US government. ALS signed “J. Ericsson,” one page, 7.5 x 9.5, June 14, 1861. Letter to an associate regarding an overdue bill. In part, “Has not your business tact and ingenuity yet enabled you to turn the war to some profitable account? I imagined that you would be just the man to be up and doing in such times.” In very good condition, with closely trimmed bottom edge, affecting several letters of signature, scattered toning and expected folds. R&R COA.