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Audichron Company was a company founded in the 1930s by John Franklin in Doraville, Georgia, [1] to produce the Audichron, a talking clock. [2] By the 1970s, there were thousands of Audichron time-of-day announcers in use all over the world. Audichron had also developed a machine to announce the temperature. During the 1970s and 1980s ...
Digital clocks typically use the 50 or 60 hertz oscillation of AC power or a 32,768 hertz crystal oscillator as in a quartz clock to keep time. Most digital clocks display the hour of the day in 24-hour format; in the United States and a few other countries, a commonly used hour sequence option is 12-hour format (with some indication of AM or PM).
The next 3 decades saw the development of quartz clocks as precision time standards in laboratory settings; the bulky delicate counting electronics, built with vacuum tubes, limited their use elsewhere. In 1932 a quartz clock was able to measure tiny variations in the rotation rate of the Earth over periods as short as a few weeks. [39]
Audichron was a talking clock, or a time announcer which was developed and produced by the Audichron Company, starting in the 1930s.There were several types of Audichron machines including the stand time piece (STM), M12, temperature machine (TEMP) and the Comparator.
The equation of time was engraved on sundials so that clocks could be set using the Sun. In 1720, Joseph Williamson claimed to have invented a clock that showed solar time, fitted with a cam and differential gearing, so that the clock indicated true solar time. [137] [138] [139]