588 BELL SYSTEM TECHNICAL JOURNAL 



131. Short Electric Waves, E. F. Nicols and J. D. Tta^r, Phys. Rev., v. 21, pp. 587-610, 



June, 1923. 



132. The shortest continuous waves, C. E. Cleeton and N. H. Williams, Phys. Rev., 



V. 50, p. 1091, December, 1936. 



133. A millimeter-wave reflex oscillator, J. M. Lafferty, //. of Applied Physics, v. 17, 



No. 12, pp. 1061-1066, December, 1946. 



134. Electromagnetic waves of 1.1 cm. wavelength and the absorption spectrum of 



ammonia, C. E. Cleeton and N. H. Williams, Phys. Rev., v. 45, pp. 234-237, 

 Feb. 15, 1934. 



135. The ammonia spectrum and line shapes near 1.25-cm. wavelength, Charles Hard 



Townes, Phys. Rev., v. 70, pp. 665-671, November, 1946. 



136. The inversion spectrum of ammonia, William E. Good, Phys. Rev., v. 70, pp. 213- 



218, August, 1946. 



137. A new method for measuring nuclear magnetic moments. (Letter to the editor), 



I. I, Rabi, J. R. Zacharias, S. Millman and P. Kusch, Phys. Rev., v. 53, p. 318, 

 1938. 



138. Molecular beam technique, I. Estermann. Reviews of Modern Physics, v. 18, No. 3, 



pp. 300-323, July, 1946. 



139. The molecular beam magnetic resonance method. The radiofrequency spectra of 



atoms and molecules. J, B, M. Kellogg and S. Millman, Reviews of Modern 

 Physics, V. 18, No. 3, pp. 323-352, July, 1946. 



140. The rotation of the earth, and the secular accelerations of the sun, moon and planets. 



H. Spencer Jones, Astronomer Royal, Monthly Notices of R. A. S., v. 99, pp. 

 541-558, May, 1939. 



