➦In 1925...the first live broadcast of the Kentucky Derby was originated by WHAS Louisville and was also carried by WGN in Chicago. The call of the Derby featured an announcer who watched from the windows of one of the famous twin spires of Churchill Downs.
➦In 1929...the anthology crime series True Detective Mysteries began its almost 30 year run, debuting on CBS radio, though its most popular years (1944-58) were on Mutual.
True Detective Mysteries were truly audience participation shows - each show provided descriptions of the true-story criminal and encouraged audiences to provide information leading to their capture. Rewards of $500 and later $1000 were offered in return for helpful clues from listeners.
➦In 1932...the Canadian Radio Broadcasting Act was passed in Ottawa, subjecting private stations to the control of the Canadian Radio Broadcasting Commission (CRBC). Five years later the Commission became the CBC.
➦In 1942...The Whistler, a radio mystery drama, made its debut on the west coast regional CBS Network. It aired on until September 22, 1955.
The show was also broadcast in Chicago and over Armed Forces Radio. On the west coast, it was sponsored by the Signal Oil Company: "That whistle is your signal for the Signal Oil program, The Whistler." There were also two short-lived attempts to form east-coast broadcast spurs: July 3 to September 25, 1946, sponsored by the Campbell Soup Company; and March 26, 1947, to September 29, 1948, sponsored by Household Finance.
➦In 1947...Jack Mullin demonstrated the Magnetophon at Institute of Radio Engineers convention. The Magnetophon tape recorder was one of the first recording machines to use magnetic tape in recording voice and music.





























