1932. No Edition Stated. 235 pages. No dust jacket. Grey cloth. Includes various diagrams. Pages are rather marked with pronounced tanning and foxing, plus thumbing. Faint water staining to margins, not affecting the text. A few dog-eared corners. Previous owner's stamps and childish pencil drawings to endpapers and pastedowns. Text block edges a little tanned with minor scratches. Boards have heavy edge wear, with bumping and fraying to corners, while spine ends are crushed and frayed. Joints worn too with splits starting. Scratched, rubbed and marked overall. Heavily foxed, mottled and water stained overall.