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  2. Current loop - Wikipedia

    en.wikipedia.org/wiki/Current_loop

    To allow the construction of hybrid systems, where the 420 mA is generated by the controller, but allows the use of pneumatic valves, a range of current to pressure (I to P) converters are available from manufacturers. These are usually local to the control valve and convert 420 mA to 3–15 psi (or 0.2–1.0 bar).

  3. 24-hour analog dial - Wikipedia

    en.wikipedia.org/wiki/24-hour_analog_dial

    A sundial showing all 24 hours; impractical but symmetrical Shepherd Gate clock outside the Royal Observatory, Greenwich The clock at Ottery St Mary, England, showing nearly noon, using the 12-hour time system on a 24-hour analog dial The 24-hour tower clock in Venice that uses double-XII system. Clocks and watches with a 24-hour analog dial ...

  4. Clock face - Wikipedia

    en.wikipedia.org/wiki/Clock_face

    The term is less commonly used for the time display on digital clocks and watches. A second type of clock face is the 24-hour analog dial, widely used in military and other organizations that use 24-hour time. This is similar to the 12-hour dial above, except it has hours numbered 1–24 (or 0–23) around the outside, and the hour hand makes ...

  5. Geochron - Wikipedia

    en.wikipedia.org/wiki/Geochron

    The Geochron was the first world clock to display day and night on a world map, showing the sinh "bell curve" of light and darkness. The Geochron employs an intricate analog clockwork mechanism for its display, that shows the month, date, day of the week, hours and minutes, the areas of the world currently experiencing day and night , and the ...

  6. Alarm clock - Wikipedia

    en.wikipedia.org/wiki/Alarm_clock

    This is an accepted version of this page This is the latest accepted revision, reviewed on 27 December 2024. Type of clock A traditional wind-up (key-wound), mechanical spring-powered alarm clock An alarm clock or alarm is a clock that is designed to alert an individual or group of people at a specified time. The primary function of these clocks is to awaken people from their night's sleep or ...

  7. Timer - Wikipedia

    en.wikipedia.org/wiki/Timer

    A typical kitchen timer. A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. An example of a simple timer is an hourglass. Commonly, a timer triggers an alarm when it ends. A timer can be implemented through hardware or software.

  8. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    24-hour digital clock in Miaoli HSR station. A public 24-hour clock in Curitiba, Brazil, with the hour hand on the outside and the minute hand on the inside.. A time of day is written in the 24-hour notation in the form hh:mm (for example 01:23) or hh:mm:ss (for example, 01:23:45), where hh (00 to 23) is the number of full hours that have passed since midnight, mm (00 to 59) is the number of ...

  9. Flip clock - Wikipedia

    en.wikipedia.org/wiki/Flip_clock

    A flip clock (also known as a "flap clock") is an electromechanical, digital time keeping device with the time indicated by numbers that are sequentially revealed by a split-flap display. The study, collection and repair of flip clocks is termed horopalettology (from horology – the study and measurement of time and palette – and the Italian ...

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