1947. No edition remarks. 267 pages. No dust jacket. This is an ex-Library book. Blue cloth covered boards with gilt. Black and white diagrams throughout. Black and white photograph frontispiece. Ex library copy with associated labels, inserts, stamps and annotations. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding remains firm. Boards have heavy shelf wear with bumping and fraying to corners and crushing, fraying and tearing to spine ends and edges. All surfaces tanned, particularly spine. Gilt lettering to spine is slightly dulled.