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The green and red shaded areas denote 3 minute periods during which radio silence was maintained to facilitate listening for distress calls at 2182 kHz and 500 kHz respectively. Ī ship's radio room wall clock during the age of wireless telegraphy showing '10:09' and 36 seconds'. Occasionally, markings of any sort are dispensed with, and the time is read by the angles of the hands. The clock face is so familiar that the numbers are often omitted and replaced with unlabeled graduations (marks), particularly in the case of watches. Clocks using only Arabic numerals first began to appear in the mid-18th century. Longcase clocks (grandfather clocks) typically use Roman numerals for the hours. The two numbering systems have also been used in combination, with the prior indicating the hour and the latter the minute. Clocks can indicate the hour with Roman numerals or Hindu–Arabic numerals, or with non-numeric indicator marks. Some special-purpose clocks, such as timers and sporting event clocks, are designed for measuring periods less than one hour. This is similar to the 12-hour dial above, except it has hours numbered 1–24 around the outside, and the hour hand makes only one revolution per day. The term is less commonly used for the time display on digital clocks and watches.Ī second type of clock face is the 24-hour analog dial, widely used in military and other organizations that use 24-hour time. The face may also include a second hand, which makes one revolution per minute. A long minute hand makes one revolution every hour. In its most basic, globally recognized form, the periphery of the dial is numbered 1 through 12 indicating the hours in a 12-hour cycle, and a short hour hand makes two revolutions in a day.
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A clock face is the part of an analog clock (or watch) that displays time through the use of a flat dial with reference marks, and revolving pointers turning on concentric shafts at the center, called hands.