1958. Fourth edition. 318 pages. No dust jacket. Blue cloth covered boards with gilt. Black and white photographs and diagrams. Colour frontispiece. Pages and binding are presentable with no major defects. Minor issues present such as mild cracking, inscriptions, inserts, light foxing, tanning and thumb marking. Overall a good condition item. Boards have mild shelf wear with light rubbing and corner bumping. Some light marking and sunning. Boards are strongly bowed.