Scale:1:12. A working mast and spar model depicting a proposed self reefing topsail (1850) as invented by Henry D P Cunningham. The model is equipped and rigged with its sail (a modern replacement) set. The model comprises of a portion of the lower mast, the maintop, topgallant and royal masts with caps and crosstrees, lower and topsail yards, stunsail yards, together with associated standing and running rigging. The royal yard has been struck and sent down for storage purposes. The whole model is mounted on its original rectangular polished mahogany baseboard. There is a wooden plaque that is attached to the baseboard and is inscribed: "Cunninghams self reefing topsail. Plan for reefing from deck (invented by) Henry D. P Cunningham 1850."