[Specification and drawings (12) re corvettes 'Turquoise', 'Ruby' and 'Tourmaline' / Admiralty (& Sheerness Dockyard and Earle's Yard, Hull and Orchard Yard, Blackwall). 1876-1877. See below. See also inv. no. 2000-909] Specification and drawings (12) re corvettes 'Turquoise' 1876-1877