Undated (circa 1950s). 224pp. Red cloth-covered boards, black titles on spine, several black and white diagrams and photographs (including frontispiece). 8vo. Boards lightly soiled. Spine heavily sun-faded. Spine ends and corners lightly rubbed and rounded. Text block edges lightly tanned, top edge moderately foxed. Free endpapers heavily tanned and moderately foxed else internally very neat, clean, bright and tight.
