Scale 1:19.2. A double sided plan of two longboats. The front and the reverse sides each show the body, profile with sheer lines and longitudinal half-breadth of a 30ft and a 29ft longboat respectively. Both sides are signed 'R. White' and annotations indicate that the 30ft boat was contracted for 4 January 1743 and the 29ft boat for 4 January 1749.