1927. No Edition Remarks. 77 pages. No dust jacket. This is an ex-Library book. Black cloth with gilt lettering to spine. Black and white diagrams throughout. Expected library inserts, stamps and inscriptions. Slight cracking to gutters with exposed netting, pages remain attached. Pages and diagrams have light tanning and foxing throughout, heavier to endpapers and first and last few pages. Boards have moderate shelf-wear with bumping to corners and rubbing to surfaces. Medium crushing to spine ends. Water marks and heavy wear marks overall. Gilt lettering is bright and clear.