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The mechanical kitchen timer was invented in 1926. The simplest and oldest type of mechanical timer is the hourglass - which is also known as "the glass of the hour" - in which a fixed amount of sand drains through a narrow opening from one chamber to another to measure a time interval.
The practice of using bells to mark time dates at least to the time of the early Christian church, which used bells to mark the "canonical hours". [2] An 8th-century Archbishop of York gave his priests instructions to sound church bells at certain times, and by the 10th century Saint Dunstan had written an extensive guide to bell-ringing to mark the canonical hours.
The BBC discourages any other sound being broadcast at the same time as the pips; doing so is commonly known as "crashing the pips". This was most often referred to on Terry Wogan's Radio 2 Breakfast show, although usually only in jest since the actual event happened rarely. [12] Different BBC Radio stations approach this issue differently.
Until a time gun was installed, the nearby Brockton Point lighthouse keeper detonated a stick of dynamite. Elsewhere in Canada, a "Noon Gun" is fired daily from the citadels in Halifax and Quebec City and from Signal Hill in St. John's, Newfoundland and Labrador. [1] In the same manner, a Noon Gun has been fired in Cape Town, since 1806. [2]
The daytime canonical hours of the Catholic Church take their names from the Roman clock: the prime, terce, sext and none occur during the first (prīma) = 6 am, third (tertia) = 9 am, sixth (sexta) = 12 pm, and ninth (nōna) = 3 pm, hours of the day. The English term noon is also derived from the ninth hour.
A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is an approximate harmonic oscillator: It swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates.
Hour is a development of the Anglo-Norman houre and Middle English ure, first attested in the 13th century. [2] [b] It displaced tide tīd, 'time' [4] and stound stund, span of time. [5] The Anglo-Norman term was a borrowing of Old French ure, a variant of ore, which derived from Latin hōra and Greek hṓrā .
Timer 0 is used by Microsoft Windows (uniprocessor) and Linux as a system timer, timer 1 was historically used for dynamic random access memory refreshes and timer 2 for the PC speaker. [ 2 ] The LAPIC in newer Intel systems offers a higher-resolution (one microsecond) timer. [ 3 ]