Undated but circa 1940. 320pp, with black and white illustrations and diagrams in text. Blue cloth-covered boards, black lettering and decoration on the spine, black motif on front panel. Decorative endpapers. 8vo. Cloth is faded and rubbed around edges and joints, gently rounded at corners and ends of sunned spine, scattered minor marks. Upper text block edge dull. Internally neat, clean and tight.
