This appears to be Cooke's original study of the 'Dreadnought' for the plate he did for the (merchant) Seamen's Hospital Society in 1831, including details of the hull set above it. For two versions of the finished plate see PAD6061 and PAD6149. Compared with the finished plates, the 'Dreadnought' appears perspectivally closer to inland (note the size of the Old Royal Naval College at left in relation to the ship). The plates have also moved the small yacht from the right-hand side (in the drawing) to the port side of the 'Dreadnought'.
'Dreadnought' was the Society's hospital ship off Greenwich from 1827 to 1856 (PvdM 1/05).