John Hays Hammond papers, 1908-1965

Biographical Note

Date	Event
1888, Apr. 13	Born, San Francisco, Calif.
1910	Graduated, Yale University, New Haven, Conn.
1911	Established Hammond Radio Research Laboratory, Gloucester, Mass.
1912	Invented "electronic dog," a photosensitive homing device Performed research on intermediate frequency United States delegate to the International Radio-Telegraphic Conference, London, England
1914	Demonstrated high-speed radio control boat to United States Army Invented proximity fuse for torpedoes Invented thermite incendiary bomb Natalia (yacht) completed 120-mile trip controlled by Hammond's radio and gyroscopic system
1916-1918	Developed continuous wave superheterodyne receiver using intermediate frequency Worked on radio-controlled submerged torpedo
1919	Doctor of Science, George Washington University, Washington, D.C.
1921	Researched, developed, and developed a frequency modulation (FM) system
1922-1923	Developed a secure telephone communication system
1925-1926	Developed unicontrol superheterodyne
1927	United States delegate to International Radio Conference, Washington, D.C.
1943	Developed a variable pitch propeller for ships
1950	Invented "Telespot," a system for secure televsion trnasmission of classified data
1959	Awarded Elliot Cresson Medal, Franklin Institute, Philadelphia, Pa.
1952	Developed dynamic accentuator for music amplification and reproduction
1965, Feb. 12	Died, New York, N.Y.