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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.
This continued until the 1940s, when time signals began to be broadcast using the radio by the government. [8] Briefly during World War II, clocks under Indian Standard Time were advanced by one hour, referred to as War Time. This provision lasted from 1 September 1942, to 15 October 1945. [11]
In Czech quarters and halves always refer to the following hour, e.g. čtvrt na osm (quarter on eight) meaning 7:15, půl osmé (half of eight) meaning 7:30 and tři čtvrtě na osm (three-quarters on eight) meaning 7:45. This corresponds to the time between 7:00 and 8:00 being the eighth hour of the day (the first hour starting at midnight).
Diagram of electric time system used around 1910 to keep time in factories, schools, and other large institutions. The master clock (bottom center), controlled by a temperature-compensated mercury pendulum, is wired to slave clocks throughout the building. In addition to wall clocks, it also controls time stamps that are used to stamp documents ...
The Indian Standard Time was adopted on 1 January 1906 during the British era with the phasing out of its precursor Madras Time (Railway Time), [2] and after Independence in 1947, the Union government established IST as the official time for the whole country, although Kolkata and Mumbai retained their own local time (known as Calcutta Time and Bombay Time) until 1948 and 1955, respectively. [3]
If one has $1000 invested for 30 days at a 7-day SEC yield of 5%, then: (0.05 × $1000 ) / 365 ~= $0.137 per day. Multiply by 30 days to yield $4.11 in interest. If one has $1000 invested for 1 year at a 7-day SEC yield of 2%, then: (0.02 × $1000 ) / 365 ~= $0.05479 per day. Multiply by 365 days to yield $20.00 in interest.
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]
In 1909, Halbert P. Gillette explained about the state of the art around time clocks in those days: IBM time clock. Time clocks.—Such an appliance which may not, in general, be used in the field, but which is of immense value in the office and particularly in a shop, is the time clock.