Pages such as this, with small ad hoc working diagrams, are scattered through Turner’s sketchbooks; like his terser written notes, they can be difficult to interpret. Inverted relative to the book’s foliation, down the right-hand side are two rough elevations of a small, symmetrical two-storey building (probably a house), and a floor plan including stairs. There is no indication as to whether the structure is real or a form of elaborate doodle.
In the middle of the page is a diagram comprising a triangular outline with horizontal divisions and an area of more complexity at the lower centre. The very specific numbering suggests measurements of a real object or plot of land, whether in inches, feet or yards. A plan of the bows of a boat or ship may be a possibility; compare the diagrams of what seem to be sails inside the front cover of the contemporary London Bridge and Portsmouth sketchbook (Turner Bequest CCVI; D40966).