7 New York
Times
, «Tesla Gets Patent on Helicopter-Plane», February 22, 1928, p. 18, col. 4.
Science & Invention,
June 1928, p. 116.


8.
Review, The Yugoslav Monthly Magazine,
July-August 1964, «Helicopter in Hansom Cab Days», pp. 31—33.

9. Microfilm letter, Tesla to Scherff, July 1, 1909, Library of Congress.
10. Microfilm letter, Tesla to Scherff, n.d., Library of Congress.
11. Microfilm letter, Tesla to Scherff, October 15, 1918, and Scherff to Tesla, 
October 1918, Library of Congress.
12. Letter, Tesla to Anne Morgan, March 31, 1913, Tesla Museum, Belgrade, 
Yugoslavia.
13. Letter, Anne Morgan to Tesla, May 3, 1913, Tesla Museum, Belgrade, 
Yugoslavia.
14. Letter, Tesla to Anne Morgan, May 7, 1913, Tesla Museum, Belgrade, 
Yugoslavia.
15. Letter, Anne Morgan to Tesla, April 26, 1926, Tesla Museum, Belgrade, 
Yugoslavia.
16. Letter, Katharine Johnson to Tesla, n.d., Tesla Museum, Belgrade, 
Yugoslavia.


Глава 21.
Радар



1. New York
Times
, March 18, 1916, p. 8, col. 3.

2. Speech by Millikan at Chemists' Club, New York, October 7, 1928.

3. The Royal Bank of Canada,
Monthly Letter,
Vol. 59, No. 11 (November 1978).


4. New York
Times,
December 8, 1915, p. 8, col. 3, See New York
Herald,
April 15, 1917.

5. Dr. Emil Girardeau, «Nikola Tesla, Radar Pioneer», translation from the 
French, presented at Nikola Tesla — Kongress, Vienna, September 1953.

6. Ibid. See also, Nikola Tesla, «The Problem of Increasing Human Energy»,
Century
magazine, June 1900, pp. 208 — 09; New York
Times,
«America's Invisible Airplane», September 7, 1980, p. 20 E.



Глава 22.
Почетный гость



1. O'Neill,
Genius,
p. 230.

2. Ibid., p. 231.

3. 
Minutes, Edison Medal Meeting,
American Institute of Electrical Engineers, May 18, 1917, Smithsonian 
Institution.

4. Ibid.
5. Ibid.
6. Ibid.
7. Petkovic, «A Visit to Nikola Tesla».