Arnold Sommerfeld - Atomic Structure & Spectral Lines. Methuen & Co. London - 1923, First edition. Arnold Johannes Wilhelm Sommerfeld, ForMemRS was a German theoretical physicist who pioneered developments in atomic and quantum physics, and also educated and mentored many students for the new era of theoretical physics. Condition: Hardcover in original brick colour cloth with Blind stamp front & gilt lettering on spine. Ex. library with very minimal stamps ( see photo) in good condition. Boards have minor corner bumping and edgewear with noticeable, tanning and scuffing overall. Spine has similar tanning with soft splitting, interior remains bright and clear, firm binding. 125 figures in texts. 626 pages, dimension 22.5 x 15.0 cm. Please view & used photos for further condition detail. Ship tracked & insured.