1926. 244 pages. No dust jacket. Blue cloth. Black and white illustrations and diagrams throughout. Pages are moderately tanned with noticeable foxing throughout. Slight crinkling to paper at gutters, however binding remains firm. Illustrations are moderately tanned with some foxing. Thumb-marking present throughout. Boards have visible edge wear with corner bumping. Moderate tanning to spine and edges with some crushing to spine ends. Gilt lettering is darkened. Marks and scratches to all surfaces. Book has a slight forward lean.