Scale: 1:48. Plan showing the body plan with stern decoration and name on the counter, sheer lines with inboard profile and figurehead, and longitudinal half-breadth for Isis (1774), a 50-gun Fourth Rate, two-decker, as completed at Chatham Dockyard. The plan was later proposed (and approved) for building Jupiter (1778) and Leander (1780).

Signed by John William [Surveyor of the Navy, 1767-1784].