1926. Seventh edition. 728 pages. No dust jacket. Brown cloth covered boards with gilt. Black and white photographs and diagrams. Pages remain bright and clean with minimal tanning and foxing. Binding slightly loose. A previous owner's name to front free endpaper. Boards have heavy shelf wear with bumping and fraying to corners and crushing, fraying and tearing to spine ends and edges. Some moderate marks and staining to surfaces. Gilt lettering remains bright and clear.