British proposal for an anonymous 3-masted central battery ironclad steam frigate in 1866

Measurement 3,082 tons. Length 250 feet. Horsepower 600 hp. To be armed with 8-9 ton guns and 2-62 ton guns. Made by the Admiralty in November 1866.

Source

Website Royals Museums Greenwich Collection search. ID NCP9127-9128-9129-9130-9131-9132-9133.