[LE ROY, Julien-David]. LE ROI. Nouvelles recherches sur les Vaisseau long des anciens, sur les voiles latines, et sur les moyens de diminuer les dangers que courent les navigateurs. 1786.

Rare first edition.
Le Roy, was an architect and professor at the Academy of Architecture.
He is interested in the Navy and seeks to make technical improvements.
To validate his solutions, he will build a prototype that he will sail and in this book he presents his results.