New library books

Advances in electronics and electron physics, volume 15. L. Marton (editor). Academic Press, Inc., 111 Fifth Avenue, New York 3, N.Y., 1961; 412 pages, 6¼ by 9¼ inches, bound; $11.50. The latest volume in a standard series, this work surveys atomic beam frequency standards, masers and other quantum mechanical amplifiers, relaxation in diluted paramagnetic salts at very low temperatures, millimeter wave techniques, the distribution of electrons in the ionosphere, and the application of the autodyne to paramagnetic resonance. Extensive references are appended to each paper.