432 BELL SYSTEM TECHNICAL JOURNAL 



2. Joseph Henry, "On Induction from Ordinary Electricity; and on the Oscillatory 



Discharge," Proc. Am. Phil. Soc, vol. 2, pp. 193-196; June 17, 1842. "Scientific 

 Writings of Joseph Henry," vol. 1, pp. 200-203, published b\' the Smithsonian 

 Institution, Washington, D. C, 1886. 



3. Hermann von Helmholtz, "Uber die Erhaltung der Kraft," published in pamphlet 



form by G. Reimer, Berlin, 1847. Reprinted in volume 1 of "Wissenschaftlichen 

 Abhandlungen von Hermann Helmholtz," by J. A. Barth, Leipzig, 1882. Re- 

 printed in Ostwald's "Klassiker der exacten Wissenschaften," Xo. 1, by Wilhelm 

 Engelmann, Leipzig, 1889. Translated into English by John Tyndall, in "Scientific 

 Memoirs, Natural Philosophy," Article IV, pp. 114-162; edited by John Tyndall 

 and William Francis, printed by Taj'lor and Francis, London, 1853. 



4. William Thomson, "On Transient Electric Currents," Phil. Mag., vol. 5, pp. 393-405; 



June, 1853. "Mathematical and Physical Papers," vol. 1, pp. 540-553. 



5. W. Feddersen, "Beitrage zur Kenntniss des elektrischen Funkens," Ann. der Phys., 



vol. 103, pp. 69-88, 1858; also vol. 108, pp. 497-501, 1859; vol. 112, pp. 452-459, 

 1861; vol. 113, pp. 437-167, 1861; vol. 115, pp. 336-343, 1862; vol. 116, pp. 132- 

 170, 1862. 



6. C. V. Boys, "Notes on Photographs of Rapidly Moving Objects and on the Oscillating 



Electric Spark," Proc. Roy. Soc. Lond., vol. 11, pp. 1-15; Nov., 1890. 



7. W. R. Grove, "An Experiment in Magneto-Electric Induction," Phil. Mag., vol. 35, 



pp. 184-185; March, 1868. 



8. M. I. Pupin, Trans. A.I.E.E., vol. 10, p. 223, 1893. (Discussion.) 



9. James Clerk Maxwell, "On Mr. Grove's 'Experiment in Magneto-Electriclnduction'. 



In a Letter to W. R. Grove, F.R.S.," Phil. Mag., vol. 35, pp. 360-363; May, 1868. 

 "Scientific Papers," vol. 2, pp. 121-124. 



10. John Hopkinson, "On the Theory of Alternating Currents, Particularly in Reference 



to Two Alternate-Current Machines Connected to the Same Circuit," Jour. Soc. 

 Tel. Engrs., vol. 13, pp. 496-515; Nov. 13, 1884. 



11. Heinrich Hertz, "Electric Waves," p. 42. Translated by D. E. Jones. The Mac- 



millan Company, London and New York, 1893 and 1900. 



12. Reference 11, page 43. 



13. OUver Lodge, "Easv Lecture Experiment in Electric Resonance," Nature, p. 368, 



Feb. 20, 1890. 



14. Oliver Lodge, "Modern Views of Electricity," p. 339, 2nd ed., 1892. 



15. T. H. Blakesley, "Papers on Alternating Currents of Electricity, for the Use of 



Students and Engineers," p. 1, 3rd ed., 1891. Whittaker & Co., London. 



16. Gisbert Kapp, "Capacity and Self-induction in Alternate Current Working. I.," 



The Electrician, vol. 26, pp. 197-199; Dec. 19, 1890. 



17. William Stanley, Jr., and John F. Kelly, "Means for Preventing the Interference 



with Speech on Telephone Circuits b}' Induced or Other Currents"; U. S. Patent 

 No. 464,529, filed May 22, 1891, issued Dec. 8, 1891. 



18. Maurice Hutin and Maurice Leblanc, French Patent No. 215,901, dated Sept. 3, 1891, 



delivered Dec. 15, 1891. See also U. S. Patetit No. 838,545, filed May 9, 1894, 

 issued Dec. 18, 1906. 



19. Maurice Hutin and Maurice Leblanc, "Etude sur les Courants Alternatifs et Leur 



Application au Transport de la Force," La Lumiere Electrique, vol. 40, p. 259; 

 May 9, 1891. 



20. M. I. Pupin, "On Electrical Oscillations of Low Frequency and Their Resonance," 



Am. Jour, of Sci., vol. 44, pp. 325-334, April; pp. 420-429, May; pp. 503-520, 

 June, 1893. "Practical Aspects of Low-Frequency Electrical Resonance," Trans. 

 AJ.E.E., vol. 10, pp. 370-394; May, 1893. 



21. M. I. Pupin. "From Immigrant to Inventor," p. 300. Charles Scribner's Sons, 



New York,' London, 1923. 



22. M. I. Pupin, "Multiple Telegraphy," U. S. Patent No. 707,007; orig. filed Feb. 23, 



1894, issued Aug. 12, 1902. 



23. John Stone Stone, "Method of Electrical Distribution and Selective Distribution," 



U. S. Patent No. 726,368; orig. filed Apr. 4, 1894, issued Apr. 28, 1903; also 726,476, 

 1903; 729,103, 1903; 729,104, 1903; 638,152, 1899. 



24. Interference in the U. S. Patent Office No. 17196 and No. 17197. 



25. Reference 21, p. 19. See also pp. 294-302. 



26. M. I. Pupin, "Fifty Years' Progress in Electrical Communications," Jour. A.LE.E., 



vol. 46, pp. 59-61, Jan.; pp. 171-174, Feb., 1927. (Presidential Address, Dec. 27, 

 1926.) 



