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Before the discovery of electromagnetic waves and the development of radio communication, there were many wireless telegraph systems proposed and tested. [4] In April 1872 William Henry Ward received U.S. patent 126,356 for a wireless telegraphy system where he theorized that convection currents in the atmosphere could carry signals like a telegraph wire. [5]
M. R. DeHaan was born in Zeeland, Michigan, to Reitze and Johanna Rozema DeHaan, emigrants from the Netherlands. [2] After graduating from Zeeland High School in 1908, he attended Hope College in Holland, Michigan, for a year, before attending and graduating from the University of Illinois College of Medicine in Chicago in 1914.
The early history of radio is the history of technology that produces and uses radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio. Radio development began as "wireless telegraphy". Later radio history increasingly involves matters of broadcasting.
1920s: Radio was first used to transmit pictures visible as television. 1926: Official Egyptian decree to regulate radio transmission stations and radio receivers. [40] Early 1930s: Single sideband (SSB) and frequency modulation (FM) were invented by amateur radio operators. By 1940, they were established commercial modes.
Archie Frederick Collins (January 8, 1869 – January 3, 1952), who generally went by A. Frederick Collins, was a prominent early American experimenter in wireless telephony and prolific author of books and articles covering a wide range of scientific and technical subjects.
In the late 1980s or early 1990s, [10] [11] [12] Baylis saw a television programme about the spread of AIDS in Africa and realised that a way to halt the spread of the disease would be to educate and disseminate information by radio. [11] [13] Within 30 minutes, he had assembled the first prototype of his most well-known invention, the wind-up ...
Paul Hutchens (April 7, 1902, Thorntown, Indiana – January 23, 1977, Colorado Springs, Colorado) was an American author.In addition to writing The Sugar Creek Gang, a series of 36 Christian-themed juvenile fiction books about the adventures of a group of young boys, he also wrote numerous adult fiction books, many with a romance theme.
Empire of the Air: The Men Who Made Radio is a non-fiction book by Tom Lewis, which traces the early development of radio broadcasting in the United States, published by HarperCollins in 1991. [2] The book was adapted into both a 1992 documentary film by Ken Burns and a 1992 radio drama written and directed by David Ossman . [ 3 ]