1962. Third edition. 184 pages. Pictorial dust jacket over orange cloth. Black and white photographs and diagrams. Colour frontispiece. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. Minor pencil inscription to front free endpaper. Boards have light shelf wear with minor corner bumping and crushing to spine ends. Unclipped jacket has light edge wear with minor tears, chipping and creasing.