Clocks

A digital clock is a type of clock that displays the time digitally (i.e. in numerals or other symbols), as opposed to an analog clock, where the time is indicated by the positions of rotating hands.

The term chronometer (From Greek: Χρονόμετρο) is a specific type of timepiece tested and certified to meet certain precision standards.

An alarm clock (or sometimes just an alarm) is a clock that is designed to alert an individual or group of individuals at specified time.

A cuckoo clock is a typically pendulum-regulated clock that strikes the hours with a sound like a common cuckoo's call and has an automaton cuckoo bird that moves with each note.

An hourglass (or sandglass, sand timer, sand watch, or sand clock) is a mechanical device used to measure the passage of time.

A quartz clock is a clock that uses an electronic oscillator that is regulated by a quartz crystal to keep time.

The timing functions are traditionally controlled by two buttons on the case.

A sundial is a device that tells the time of day by the apparent position of the Sun in the sky.

An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element.

A real-time clock (RTC) is a computer clock (most often in the form of an integrated circuit) that keeps track of the current time.

A water clock or clepsydra (Greek κλεψύδρα from κλέπτειν kleptein, 'to steal'; ὕδωρ hydor, 'water') is any timepiece in which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel where the amount is then measured.

A diving watch, also commonly referred to as a diver's or dive watch, is a watch designed for underwater diving that features, as a minimum, a water resistance greater than 1.

An electric clock is a clock that is powered by electricity, as opposed to a mechanical clock which is powered by a hanging weight or a mainspring.

A watchmaker is an artisan who makes and repairs watches.

Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks.

A parking meter is a device used to collect money in exchange for the right to park a vehicle in a particular place for a limited amount of time.

A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element.

The incense clock (simplified Chinese: 香钟; traditional Chinese: 香鐘; pinyin: xiāngzhōng; Wade–Giles: hsiang-chung; literally: "fragrance clock") is a Chinese timekeeping device that appeared during the Song Dynasty (960-1279) and spread to neighboring countries such as Japan.

A longcase clock, also tall-case clock, floor clock, or grandfather clock, is a tall, freestanding, weight-driven pendulum clock with the pendulum held inside the tower, or waist of the case.

A marine chronometer is a timepiece that is precise and accurate enough to be used as a portable time standard; it can therefore be used to determine longitude by means of celestial navigation.

A clock face or dial is the part of an analog clock (or watch) that displays the time through the use of a fixed-numbered dial or dials and moving hands.

A nocturnal is an instrument used to determine the local time based on the relative positions of two or more stars in the night sky.

Linnaeus' flower clock was a garden plan hypothesized by Carolus Linnaeus that would take advantage of several plants that open or close their flowers at particular times of the day to accurately indicate the time.

It is considered to be a showcase design and intentionally exposes to plain view the various gears, wheels and springs within the movement itself.

The Westminster Quarters is the most common name for a melody used by a set of clock bells to chime on each quarter-hour.

A schema for horizontal dials is a set of instructions used to construct horizontal sundials using compass and straightedge construction techniques, which were widely used in Europe from the late fifteen century to the late nineteen century.

A world clock is a clock which displays the time for various cities around the world.

A radio clock or radio-controlled clock (RCC) is a clock that is automatically synchronized by a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock.

Whittington chimes is the name of a clock chime melody, also called St.

A master clock is a precision clock that provides timing signals to synchronise slave clocks as part of a clock network.

A time clock, sometimes known as a clock card machine or punch clock or time recorder, is a mechanical (or electronic) timepiece used to assist in tracking the hours worked by an employee of a company.

Clock drift refers to several related phenomena where a clock does not run at exactly the same rate as a reference clock.

Oil-lamp clocks are clocks consisting of a graduated glass reservoir to hold oil - usually whale oil, which burned cleanly and evenly - supplying the fuel for a built-in lamp.