Graduated Bar Scale. A plan of the method used to fix the sprung main mast for Rover (1832), an 18-gun flush-deck Ship Sloop, while off the Falkland Islands, 28 May 1836. The plan shows the top of the main mast and a length of the top mast with the rigging and sails. It is also annotated with a key to the diagram and and explanation of the events surrounding the repair.