Instruct: Classify Amazon reviews into positive or negative sentiment
Query: For the specialist, but a valuable look.

Certainly "The 50-Gun Ship" is not a book for the reader only casually interested in the Age of Sail. But for someone who wants to delve deep into the more obscure corners of the world of the Royal Navy during the 18th and early 19th Centuries, this book is a worthwhile addition to the library. 50-gun ships suffered from being neither fish nor fowl, being too small for the line of battle and too large to serve as frigates, and are usually neglected in histories of the era. However, they did see considerable service and Winfield's book fills in the void in the historical record. And there is a bonus here for fan's of Patrick O'Brian and his hero, Jack Aubrey of the Royal Navy. One of Jack's least favorite commands, the "Horrible Old Leopard", is prominently featured in this volume, including meticulously detailed cutaway drawings and hull plans.