Scale: Graduated Bar Scale. Plan showing the starboard waterline elevation for Viola of Portland, a 'hermaphrodite' (brigantine-rigged) sailing whaler, illustrating the rigging and sail plan. The plan also includes details of the mast fittings and details of the rigging chains for the yards. This plan was based on the original spar and sail plan. The plan was reproduced with special permission from the copyright holder by the Nautical Research Guild.

The reverse shows the upper deck plan, deck elevation with fittings, body plan, sheer lines,a nd longitudinal half-breadth for Viola of Portland. The plan includes a table of the painting scheme.