694 BELL SYSTEM TECHNICAL JOURNAL 



2. G. W. Kenrick and G. W. Piclcard, "Summary of Progress in the Study of 



Radio Wave Propagation Phenomena," Proc. I. R. E., 18, 649, April 1930, and 

 references. 



3. Lloyd Espenschied, C. N. Anderson, and Austin Bailev, "Transatlantic Radio 



Telephone Transmission," Proc. I. R. E., 14, 7, February 1926, B. S. T. J., July 

 1925. 



4. C. N. Anderson, "Correlation of Long- Wave Transatlantic Radio Transmission 



with Other Factors Affected by Solar Activity," Proc. I. R. £., 16, 297, March 

 1928. 



5. L. W. Austin, "Solar Activity and Radio Telegraphy," Proc. I. R. E., 20, 280, 



February 1932, and references. 



6. G. W. Pickard, "The Correlation of Radio Reception with Solar Activity and 



Terrestrial Magnetism," Proc. I. R. E., 15, 83, February 1927; also, 15, 749, 

 September 1927. 



7. G. W. Pickard, "The Relation of Radio Reception to Sunspot Position and Area," 



Proc. I. R. £., 15, 1004, December 1927. 



8. H. L. Reitz, "Mathematical Statistics " (book). Open Court Publishing Company, 



Chicago, 1927, Chapter IV. 



9. H. B. Maris and E. O. Hulburt, "A Theory of Auroras and Magnetic Storms," 



Phys. Rev., March 1929. 



10. J. Bartels, "Terrestrial-Magnetic Activity and Its Relations to Solar Phe- 



nomena," Terr. Mag., 37, 1, March 1932. 



11. C. N. Anderson, "Notes on the Effect of Solar Disturbances on Transatlantic 



Radio Transmission," Proc. I. R. E., 17, 1528, September 1929. 



12. I. J. Wymore, "The Relation of Radio Propagation to Disturbances in Ter- 



restrial Magnetism," Proc. I. R. E., 17, 1206, July 1929. 



13. A. M. Skellett, "Disturbances in Radio Transmission," Bell Laboratories Record, 



13, 164, February 1935. 



14. H. B. Maris and E. O. Hulburt, "Wireless Telegraphy and Magnetic Storms'," 



Proc. I. R. E., 17, 494, March 1929. 



15. C. N. Anderson, "Notes on Radio Transmission," Proc. I. R. E., 19, 1150, July 



1931. 



16. L. W. Austin and I. J. Wymore, "Radio Signal Strength and Temperature," 



Proc. I. R. E., 14, 781, December 1926. 



17. K. Sreenivasan, "On the Relation Between Long- Wave Reception and Certain 



Terrestrial and Solar Phenomena," Proc. I. R. E., 17, 1793, October 1929. 



18. I. J. Wymore-Shiel, "A Correlation of Long- Wave Radio Field Intensity with the 



Passage of Storms," Proc. I. R. E., 19, 1675, September 1931. 



19. Isabel S. Bemis, "Some Observations of the Behavior of Earth Currents and 



Their Correlation with Magnetic Disturbances and Radio Transmission," 

 Proc. I. R. E., 19, 1931, November 1931. 



20. Charles P. Olivier, "Meteors" (book), Williams and Wilkins, Baltimore, 1925, 



Chapter 16, p. 182. 



21. A. M. Skellett, "The Ionizing Effect of Meteors," Proc. I. R. E., 23, 132, Febru- 



ary 1935. 



22. A. M. Skellett, "The Ionizing Effect of Meteors in Relation to Radio Propaga- 



tion," Proc. I. R. E., 20, 1933, December 1932. 



23. G. W. Pickard, "A Note on the Relation of Meteor Showers and Radio Recep- 



tion," Proc. I. R. E., 19, 1166, July 1931. 



24. L. W. Austin, "Tables of North Atlantic Radio Transmission Conditions for 



Long- Wave Daylight Signals for the Years 1922-1930," Proc. I. R. E., 20, 689, 

 April 1932. 



25. L. J. Briggs, "North Atlantic Radio Transmission Conditions for Long-Wave 



Daylight Signals for the Years 1931 and 1932" (Letter to the Editor), Terr. 

 Mag., 38, 67, March 1933. 



26. J. Bartels, "Terrestrial-Magnetic Activity in the Years 1931 and 1932," Terr. 



Mag., 39, 1, March 1934. 



27. Charles Chree, "The Criterion of Magnetic Disturbance," Terr. Mag., 28, 33, 



March 1923. 



28. J. Bartels, "Terrestrial-Magnetic Activity in the Year 1933 and at Huancayo," 



Terr. Mag., 40, September 1935. 



