Charles E. Apgar (edit | talk | history | protect | delete | links | watch | logs | views) references

• "Charles E. Apgar Material, 1880, 1906". Mount Holyoke and Hampshire College archives. Five College Consortium. Retrieved 31 December 2019.
• "Interview with Charles E. Apgar". SONIC – Sound ONline Inventory Catalog. Library of Congress. Retrieved 28 December 2019. Interview with Charles E. Apgar who for fourteen nights around June 18, 1915 recorded messages broadcast by a German owned and operated radio station in Sayville, Long Island. The U.S. government asked Apgar to do this because the station was broadcasting encoded information to Germany about American shipping for German submarines off-shore. Based on Apgar's recordings, the government seized the station on July 8, 1915. Apgar used his homemade radio receiver and an Edison cylinder phonograph to record the messages. During the interview he plays two of the original cylinders.
  This audio cassette was copied from two 12-inch 78rpm aluminum discs which the Library does not own.{{cite web}}: CS1 maint: url-status (link)
• "Mayes Tape Library Index". Antique Wireless Society. Retrieved 28 December 2019.
• "Digital Collections". Benson Ford Research Center. The Henry Ford. Retrieved 27 December 2019.
• McLeod, Elizabeth. "Documenting Early Radio: A Review of Existing Pre-1932 Radio Recordings". Old Time Radio Library. Retrieved 2016-01-24.

• "Triumph of Wireless Telegraphy". The Nashville American. Nashville, Tennessee. September 19, 1901.
• "Personals and Church News". The Christian Advocate. New York. April 28, 1904. p. 672. Retrieved 23 December 2019.
• Apgar, C. E. (February 1906). "A Westfield Home: The Advantages of Home Ownership in General and of Westfield Homes in Particular Set Forth". The Suburbanite; a monthly magazine for those who are and those who ought to in interested in suburban homes. Vol. III, no. 11. Passenger Department, Central Railroad of New Jersey. pp. 15–17. Retrieved 2 January 2020.
• Proceedings of the M. W. Grand Lodge of Free and Accepted Masons of the State of New Jersey. Trenton, NJ: MacCrellish & Quigley. 1907. p. XLI.

• "4,000 Miles by Wireless: Nauen, Germany, Communicates with the Station at Sayville, L.I.". New York Times. May 10, 1913.
• "Send a Wireless Through to Berlin". New York Times. July 15, 1913. p. 1.
• Van Der Woude, Fritz; Seelig, Alfred E. (July 1913). "The High Power Telefunken Radio Station at Sayville, Long Island". Proceedings of the Institute of Radio Engineers. 1 (3): 23–35. doi:10.1109/JRPROC.1913.216587.
• Apgar, Chas. E. (January 1914). "A New Type of Tuning Coil". Modern Electrics & Mechanics. Vol. 28, no. 1. New York: Modern Publishing. pp. 106, 108. Retrieved 10 January 2020.
• "Check on Wireless to keep Neutrality". New York Times. August 6, 1914. p. 4.
• "German Wireless again: Sayville Station Still Sending Out Code Messages, it is said". New York Times. August 15, 1914. p. 4.
• Year Book: 1914. New York: The Institute of Radio Engineers. 1914. p. 24.
• "Germans Treble Wireless Plant". New York Times. April 23, 1915.
• "Fear Wireless Trap Caught Lusitania: Close Scrutiny of All Messages at Two German Stations Called For". New York Times. May 10, 1915. p. 7.
• Radio Service, Department of Commerce (July 1, 1915). Radio Stations of the United States. Washington: Government Printing Office. p. 82.
• "Providence Journal Collects All Wireless Messages and Forwards Them to Government". Providence Daily Journal. July 1, 1915. pp. 1–2. German Embassy Uses Station Constantly to Supply Secret Information to Berlin Concerning Movement of Allied Armies and Fleets
• "Plant Under Suspicion: Officers Think German Station May Send Messages to Submarines". New York Times. July 1, 1915. pp. 1–2.
• "Radio Secrets of Sayville in 'canned' Form: Uncle Sam Got Records of Messages on a Phonograph". Detroit Free Press. July 18, 1915.
• Gernsback, Hugo, ed. (September 1915). "Why Sayville Radio Station Was Closed" (PDF). The Electrical Experimenter. Vol. III, no. 5. New York. pp. 210, 215. Retrieved 22 December 2019.
• Gernsback, Hugo, ed. (September 1915). "Sayville, the News-Way to Berlin" (PDF). The Electrical Experimenter. Vol. III, no. 5. New York. pp. 209–210. Retrieved 22 December 2019.
• Apgar, Charles E. (September 1915). "Making the Records from Sayville: A Description of My Set and How I worked It" (PDF). The Wireless Age. Vol. 2, no. 11. New York: Marconi Publishing. pp. 877–880. Retrieved 26 December 2019.
• "A Wireless Detective in Real Life" (PDF). The Wireless Age. Vol. 2, no. 11. New York: Marconi Publishing. September 1915. pp. 872–877. Retrieved 26 December 2019.
• Apgar, Charles E. (November 1915). Gernsback, Hugo (ed.). "The Amateur Radio Station Which Aided Uncle Sam" (PDF). The Electrical Experimenter. Vol. III, no. 7. New York. pp. 337–338. Retrieved 22 December 2019. Naturally the matter of making permanent records occurred to me about this time. I bought a second-hand phonograph and on Oct. 28, 1913, made my first record of wireless; this being 'press' sent out by the New York Herald station at the Battery in New York.
• "The Quenching of Sayville: The close of a Sordid Story". The Wireless World. Vol. 3, no. 32. Strand, London: Wireless Press. November 1915. pp. 515–517. Retrieved 29 December 2019.
• The Wesleyan University Bulletin. Vol. 10. Middletown, CT: Wesleyan University. May 1916. p. 61.
• "Westfield, N. J., Radio Station". QST. Hartford, CT: American Radio Relay League. December 1916. p. 30.
• Jones, John Price (1917). America Entangled: The Secret Plotting of German Spies in the United States and the Inside Story of the Sinking of the Lusitania. New York: A. C. Laut. p. 116.
• Flynn, William J. (August 25, 1918). "The Eagle's Eye: True Story of the Imperial German Government's Spies and Intrigues in America". The Atlanta Constitution. p. 12F.
• Jones, John Price; Hollister, Paul Merrick (1918). "The Wireless System". The German Secret Service in America. Boston: Small, Maynard & Company. pp. 43–59.
• Cooper, Courtney Ryley; Flynn, William James (1919). The Eagle's Eye: A True Story of the Imperial German Government's Spies and Intrigues in America from Facts Furnished by William J. Flynn, Recently Retired Chief of the U.S. Secret Service. New York: McCann. ASIN B009QJTQCO. {{cite book}}: Unknown parameter |lastauthoramp= ignored (|name-list-style= suggested) (help)

• "Out of the Air". The Sun. Baltimore, MD. June 12, 1921. p. F2.
• By One of Them (July 1922). "The Secret Service of the Air". Popular Radio. Vol. I, no. 3. New York. p. 349. Retrieved 22 December 2019.
• Taussig, Charles William (1922). "What the amateur has done in radio". Book of Radio. New York: Appleton and Company. pp. 194–195. ASIN B0040X4OXM.
• Burns, William J. (November 1923). "Radio puts on Gum Shoes". Popular Radio. Vol. IV, no. 5. New York. p. 349. Retrieved 1 January 2020.
• "Hartford Is Capital of American Relay League". Providence Sunday Jounral. October 13, 1929.

• "War-Time Wireless Signals in Wax: New Addition to Museum of Radio Relics". Daily Boston Globe. June 3, 1934. p. A49.

• "55,000 Amateur Radio 'Hams' Aid in Drive on Fifth Column". New York Herald Tribune. September 29, 1940. To date there has been nothing to compare with the World War service of Charles Apgar...
• Harold P. Westman, ed. (1945). "Amateur Radio and the A.R.R.L.". Radio Pioneers, 1945. New York: Institute of Radio Engineers. pp. 28–31.

• "Charles E. Apgar, Helped Trap Spies: Intercepted Radio Signals Guiding U-Boats in 1915". New York Herald Tribune. August 19, 1950. p. 8. Charles E. Apgar, eighty-five, one of the central figures in a 1915 expose of a German espionage ring, died yesterday at his home, 549 Carleton Road. Mr. Apgar was engaged in electrical research at a laboratory in his home on Carleton Road in 1915 when he intercepted and made recordings of wireless signals by spies in Union County, N. J., to direct German submarine commanders off the East Coast. His findings, later decoded by the Secret Service, enabled them to locate the spy headquarters and a wireless transmitter at Sayville, L. I.
• "Charles E. Apgar, Radio Expert, 86; Jersey 'Ham' Operator Dies – Recorded Code Messages From Sayville Station in 1915". New York Times. August 19, 1950. p. 12. Charles E. Apgar, a 'ham' radio operator who recorded code messages during World War I from a German station at Sayville, L.I., which proved to be tips to German submarines on the movements of neutral ships and caused the Government to seize the station...
• "Strays: Charles E. Apgar". QST. Hartford, CT: American Radio Relay League. November 1950. p. 106. Charles E. Apgar, ex-2MN [sic], won pre-World War 1 prominence for his experiments with advanced receiving circuits and the recording of wireless signals.
• Hogg, F.S. (December 1950). "Notes and Queries – Obituary: Mr. Charles E. Apgar". Journal of the Royal Astronomical Society of Canada. 44: 247. Bibcode:1950JRASC..44..247H.

• "Mrs. Charles E. Apgar". New York Times. March 29, 1969. p. 35.

• Biel, Michael Jay (1978). The Making and Use of Recordings in Broadcasting Before 1936 (Doctoral dissertation). Northwestern University.

• Douglas B., Craig (2003). "The Radio Age: The Growth of Radio Broadcasting, 1895-1940". Fireside Politics: Radio and Political Culture in the United States, 1920-1940. John Hopkins University Press. pp. 3–4. ISBN 9780801875120.
• Winkler, Jonathan Reed (2009). "Neutrality and Vulnerability". Nexus. Harvard University Press. pp. 51–52. ISBN 9780674033900.
• Evans, Heidi J. S. (2010). "'The Path to Freedom'? Transocean and German Wireless Telegraphy, 1914-1922" (PDF). Historical Social Research. 35 (1): 208–233. doi:10.12759/hsr.35.2010.1.209-233.

• Horning, Susan Schmidt (2013). Chasing Sound: Technology, Culture, and the Art of Studio Recording from Edison to the LP. Johns Hopkins University Press. p. 59. ISBN 9781421410227.
• "The Sinking of the Lusitania: A Ham Radio Connection". ARRL. American Radio Relay League. April 29, 2015. Retrieved 29 December 2019.
• "CQ Names 2015 Hall of Fame Inductees". ARRL. American Radio Relay League. May 15, 2015. Retrieved 29 December 2019.
• Bartlett, Richard A. (2015). "Amateurs During World War I". The World of Ham Radio, 1901-1950: A Social History. McFarland. pp. 48, 52, 263. ISBN 9781476612607.
• Gernsback, Hugo (2016). "Introduction". In Wythoff, Grant (ed.). The Perversity of Things: Hugo Gernsback on Media, Tinkering, and Scientifiction. University of Minnesota Press. ISBN 9781452953144. Charles A. Apgar, an amateur inventor and contributor to Gernsback's magazines, had devised a way to record wireless telegraph signals on phonographic cylinders, the first permanent record of a wireless message ever produced.