As difficult as it is to trim a sail and keep it trimmed, it is just as easy to mis-trim a sail. This manual from the 1920s describes what the regatta and cruising sailor of that time needed to know in order to optimally trim a then-modern and now traditional rig. This very aspect is what makes the work appealing today: there is plenty of literature on trimming modern sails, but trimming classic sails remains largely a matter of experience. This book addresses that gap, providing both theoretical and practical insights, along with numerous images, on how to optimally set traditional sails. Additionally, the book includes valuable maintenance and equipment tips.