surveyed by E. Killwick Calver, Master R.N., 1828-1849, the entrance below the narrows re-surveyed by E.K. Calver, Staff Comr. R.N., assisted by E.C. Davison, Paymaster, and G.H. Inskip, Master, R.N., April 1865 ; published according to Act of Parliament at the Hydrographic Office of the Admiralty May 17th 1849 ; Engraved by J. & C. Walker