1936. First Edition. 381 pages. No dust jacket. Grey cloth with red lettering. Black and white photographic frontispiece with illustrated diagrams and photographic illustrations throughout. Binding remains firm. Pages are lightly tanned throughout with light foxing to front and rear of book and gutters to centre of book. Illustrations are bright and clear, with some light tanning and foxing to edges. Previous owner's inscription to front pastedown. Pen mark to frontispiece. Boards have heavy shelf-wear with bumping to corners and rub wear all over. Moderate tanning and staining to spine with crushing to ends. Heavy wear marks and some staining overall.