Specification (steel masts) for Archer (1885), Brisk (1886), Cossack (1886), Mohawk (1886), Porpoise (1886), Racoon (1887), Serpent (1887), and Tartar (1886).
A dyeline copy of a handwritten 8 page specification for 8 steel masts for the Archer class twin screw Third Class cruisers Archer (1885), Brisk (1886), Cossack (1886), Mohawk (1886), Porpoise (1886), Racoon (1887), Serpent (1887), and Tartar (1886), dated 20 July 1886.