1947. Reprint. 176 pages. No dust jacket. Orange cloth. Black & white diagrams. Pages are moderately tanned and foxed throughout. Binding is shaky, however pages remain fully attached. Pencil inscription to front endpaper & pastedown. Boards have moderate edge-wear with bumping to corners and rubbing to surfaces. Spine has crushing to both ends. Spine is heavily tanned. Book has forward lean. Black staining present.