1922. First English Edition. 123 pages. No dust jacket. Brown cloth with gilt lettering to spine. Four black and white diagrams within. Noticeable cracking to front hinge and to gutters, exposing netting. However binding throughout remains firm with all pages attached. Pages are clean overall, with mild tanning throughout. Previous owner's inscription in blue pencil to front pastedown. Occasional thumb-marking. Boards have noticeable edge wear with corner bumping. Visible tanning to spine and edges with some crushing to spine ends. Small splits to spine ends and corners; cloth is slightly frayed. Black marks with faint water staining to both boards. Gilt lettering to spine is slightly dulled. Minor dents around edges. Book has a slight forward lean.