Eric Shanes has identified this sketch south from Devil’s Point with boats in Barn Pool below Mount Edgcumbe, made with the page turned horizontally, as the source for the right-hand half of the untraced watercolour Plymouth Sound of about 1813,1 engraved in 1815 for The Rivers of Devon, but not published until 1823 (Tate impressions: Tate T06010, T05786; see the concordance of the series in the Introduction to the 1813 West Country tour).2 Similar shipping appears in the engraved design, while the left-hand half was based on the drawing on folio 9 recto (D09226). It is unusual for Turner to use two consecutive pages in a ‘portrait’-format sketchbook turned sideways to record a wide view of a single scene, his usual practice being to use a double-page spread in a ‘landscape’-format book, but presumably he did not have one to hand.
The drawing made nearby on folio 8 recto (D09225) was the basis of a companion Rivers of Devon design showing Plymouth Citadel. The subjects as far as folio 127 recto (D09358) are all identified or presumed sites within a few miles in and around Plymouth, suggesting a series of fairly short excursions.
There is some brown staining towards the lower left and a small mark in blue ink or watercolour at the centre of the bottom edge, possibly made accidentally when Turner consulted the sketch for his watercolour.