Members of the Royal Corps of Naval Constructors are responsible for the design and construction of H.M. Ships, and one of the main features of their training is the study of mathematics. The aim of this article is to give the VIth form mathematics teacher an acquaintance with the kind of mathematics used in ship design, he may then be able to encourage some of his pupils to consider the prospect of a career in the Royal Corps. Promising mathematicians with a strong practical bent can enter from school under a scheme advertised in this number of the Gazette.