Chilean cruiser Esmeralda (1883)
The Chilean cruiser Esmeralda was the first protected cruiser, a ship type named for the arched armored deck that protected vital areas like propulsion machinery and ammunition magazines. The British shipbuilder Armstrong Mitchell constructed Esmeralda in the early 1880s, and the company's founder hailed the new ship as "the swiftest and most powerfully armed cruiser in the world".
Source: Wikipedia — Chilean cruiser Esmeralda (1883) (CC BY-SA 4.0)