Naval officer and author, born Brown County, Ohio; died Washington, D.C.
He served with Dupont's fleet during the Civil War, was chief of the Bureau of Yards and Docks, 1869-71, and of the Bureau of Navigation, 1871-78.
He designed the ram, Katahdin, and a life-raft, Ammen balsa, used in the navy, and made a survey for a Nicaraguan Canal which he strongly advocated.
Ammendale, near Washington, was named after him; it is the seat of a Christian Brothers' novitiate.
Appointed rear-admiral, 1877, he resigned, 1878.
His writings include "Recollections of Grant" and "The Old Navy and the New" (autobiographical).
New Catholic Dictionary