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The English word clock first appeared in Middle English as clok, cloke, or clokke. The origin of the word is not known for certain; it may be a borrowing from French or Dutch, and can perhaps be traced to the post-classical Latin clocca ('bell'). 7th century Irish and 9th century Germanic sources recorded clock as meaning 'bell'. [74]
An hourglass (or sandglass, sand timer, or sand clock) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance (historically sand ) from the upper bulb to the lower one due to gravity .
Analog clocks display time with an analog clock face, which consists of a dial with the numbers 1 through 12 or 24, the hours in the day, around the outside. The hours are indicated with an hour hand , which makes one or two revolutions in a day, while the minutes are indicated by a minute hand , which makes one revolution per hour.
In striking clocks, the striking train is a gear train that moves a hammer to strike the hours on a gong. It is usually driven by a separate but identical power source to the going train. In antique clocks, to save costs, it was often identical to the going train, and mounted parallel to it on the left side when facing the front of the clock. [11]
This template does not put a working clock on your page. This template adds a clock that shows the time when the page was last updated (or re-cached) and will not update each minute. If you do want a clock that constantly updates, then go to your Preferences and enable the item:
Other formats include a written worksheet round, where teams work together for 2–5 minutes to agree on their written answers. [20] [21] [22] Match length is determined by either a game clock or the number of questions in a packet. [3] [17] In most formats, a game ends once the moderator has finished reading every question in a packet, usually ...
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).
In nearly all quartz clocks and watches, the frequency is 32 768 Hz, [1] and the crystal is cut in a small tuning fork shape on a particular crystal plane. [2] This frequency is a power of two ( 32 768 = 2 15 ), just high enough to exceed the human hearing range , yet low enough to keep electric energy consumption , cost and size at a modest ...
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