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As each day progresses, the map is scrolled from left to right by gear mechanisms, and the arrows for each time zone shift their positions relative to a stationary band fixed at the top that has a horizontal series of numbers representing hours. The viewer may read the time by seeing what number the time zone's arrow is currently pointing to.
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The following other wikis use this file: Usage on ar.wikipedia.org في اتجاه عقارب الساعة; Usage on ca.wikipedia.org Sentit horari
The clock face with its clock positions is a heritage of Roman civilization, as is suggested by the survival of Roman numerals on old clocks and their cultural predecessors, sundials. The mechanical clock supplanted the sundial as the major timekeeper, while the Hindu–Arabic numeral system replaced the Roman as the number system in Europe in ...
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There are homemade versions of the design which employ a 9-minute top rail, with the middle rail representing multiples of 10. KinetiClocK for example, is the newest rolling ball clock design with a focus on simplicity, durability, and aesthetics. Arrow Handicraft also manufactured the coin clock, which used pennies instead of balls.
Longcase clocks (grandfather clocks) typically use Roman numerals for the hours. Clocks using only Arabic numerals first began to appear in the mid-18th century. [citation needed] The clock face is so familiar that the numbers are often omitted and replaced with unlabeled graduations (marks), particularly in the case of watches. Occasionally ...
Numbers in left column refer to the "minutes to midnight" (nuclear war) as the values of the clock are usually expressed. At right column are the raw times. The little mushroom cloud is meant to remove any ambiguity about which direction is more positive.