Bookplate of former owner mounted on front pastedown, faint name stamp on title page. No other defects; pages are clean and crisp, the binding is tight and square; book appears unread. Bound in navy cloth with bright silver titles to front cover and spine. Lacking the dust jacket. . This is the enlarged second edition. . Methuen's Monographs on Physical Subjects Series. 12mo 7" - 7" tall. 120 pages. G3