Graduated bar scale. A damaged plan showing the profile, body and longitudinal half-breadth of an unnamed 17th century warship, probably of Spanish origin. A note attached to the plan reads: 'Unknown plan - No Provenance. Donated by Dr Roger Knight who has given it amongst a number of prints [?] Copy of caroneli, print of Britannia [?] Late 17C [?] Spanish [?]; 6-5-1974'.