The oscilloscope can be adjusted so that repetitive signals can be observed as a continuous shape on the screen.A storage oscilloscope allows single events to be captured by the instrument and displayed for a relatively long time, allowing observation of events too fast to be directly perceptible. storage oscilloscope allows single events to be captured by the instrument and displayed for a relatively long time, allowing observation of events too fast to be directly perceptible.
On 27 August 1920, regular wireless broadcasts for entertainment began in Argentina, pioneered by the group around Enrique TelÃ©maco Susini, and spark gap telegraphy stopped. On 31 August 1920 the first known radio news program was broadcast by station 8MK, the unlicensed predecessor of WWJ (AM) in Detroit, Michigan.
Oldies stations as they are known today did not come into existence until the early 1970s. In the 1970s, KOOL-FM in Phoenix, Arizona became one of the first radio stations to play oldies music, at that time focusing on the 1950s and early 1960s. KOOL is still playing oldies today. In the 1960s very few Top 40 Radio stations played anything older than a few years old.