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  2. Charles F. Dowd - Wikipedia

    en.wikipedia.org/wiki/Charles_F._Dowd

    In 1869, he presented his idea to a committee of railway superintendents in New York. As a result, in 1870 he published a pamphlet entitled "A System of National Time for Railroads" wherein he proposed four time zones, each 15° wide, the time of each being one hour different from the next, named Washington, first, second, and third hours.

  3. Clock synchronization - Wikipedia

    en.wikipedia.org/wiki/Clock_synchronization

    Clock synchronization is a topic in computer science and engineering that aims to coordinate otherwise independent clocks. Even when initially set accurately, real clocks will differ after some amount of time due to clock drift, caused by clocks counting time at slightly different rates. There are several problems that occur as a result of ...

  4. SimplexGrinnell - Wikipedia

    en.wikipedia.org/wiki/SimplexGrinnell

    Meanwhile, Edward G. Watkins founded the Simplex Time Recorder Company in 1894. Watkins invented and patented one of the first practical time clocks, along with the synchronized clock systems seen in schools up until recent times. The company, located in Gardner, Massachusetts, purchased the IBM Time Equipment Division in 1958. [7]

  5. Clock network - Wikipedia

    en.wikipedia.org/wiki/Clock_network

    A clock network or clock system is a set of synchronized clocks designed to always show exactly the same time by communicating with each other. Clock networks usually consist of a central master clock kept in sync with an official time source, and one or more slave clocks which receive and display the time from the master.

  6. Standard Electric Time Company - Wikipedia

    en.wikipedia.org/wiki/Standard_Electric_Time_Company

    A Standard 200177 fire alarm pull station. The Standard Electric Time Company was a Springfield, Massachusetts company founded in 1884, and was a manufacturer of synchronized clock systems and fire alarm systems. They were the oldest manufacturer of electric clocks in the United States. The company was acquired by Johnson Controls in 1970 and ...

  7. Clock recovery - Wikipedia

    en.wikipedia.org/wiki/Clock_recovery

    Clock recovery addresses this problem by embedding clock information into the data stream, allowing the transmitter's clock timing to be determined. This normally takes the form of short signals inserted into the data that can be easily seen and then used in a phase-locked loop or similar adjustable oscillator to produce a local clock signal ...

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