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Three complications on a Gallet MultiChron Navigator (1943): a crown-controlled synchronizable second hand, a direction-finding 24-hour hand, and a 45-minute recording chronograph In horology , a complication is any feature of a timepiece beyond the display of hours, minutes and seconds.
Sundial with 24-hour analog dial. Sundials use some or all of the 24-hour dial, because they show the position of the sun in the sky. Sometimes, for aesthetic rather than practical reasons, all the 24 hour marks are shown. Medieval clocks often used the 24-hour analog dial, influenced by the widespread example of the astrolabe. [5]
The only other widely used clock face today is the 24 hour analog dial, because of the use of 24 hour time in military organizations and timetables. Before the modern clock face was standardized during the Industrial Revolution , many other face designs were used throughout the years, including dials divided into 6, 8, 10, and 24 hours.
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Besides being the first time zone calculating wristwatch based upon a 12-hour system (24 hour world time wristwatches were produced by Patek Philippe in 1937), [8] the Flight Officer was the first wristwatch with a rotating bezel and one of the world's first wrist chronographs to be housed in a water-resistant case. [5]
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 only one revolution per day.
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related to: 24 hour watch dial gauge repair service prices today