Scale 1:12. A plan showing the sheer lines, longitudinal half-breadth and body of the yacht Pequod (fl. 1980), illustrating modifications made to the keel by way of external ballast.

A note on the plan reads 'The original photograph copy of the sheer has very little information as to its origin, only as follows: 19 foot boats for Mr. Pollare & Sons; 1927; A. Hunt; Photograph No. 8615 Science Museum'.