London: Methuen & Co., 1946. 2nd Edition. Hardcover. 18mo. Methuen's Monographs on Physical Subjects. Blue cloth boards. viii, 120 pp. With 80 diagrams. Front board slightly bowed. Spine cocked, soiling to top edges. Foxing to edges of text block. Dust jacket is sunned, foxed and bumped to extremities, a few..... More