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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 ...
Comment in the article the pictures has no caption, nor is the clock tower mentioned in the section that the picture appears. The only mention of the clock tower is further down (" The belltower and the civic clock tower, often used as the symbol of Graz, were spared after the people of Graz paid a ransom for their preservation ").
A list of the tallest structures with clocks on their exterior that can be seen from the ground. The list includes various structures with a working clock face or faces on their exteriors. The first type of structure are proper Clock towers which are structures that fulfil the definition of a tower with a clock face or faces on the exterior ...
Alarm Clocks. 725-2008 Prior to the year 725, no one was ever on time for anything. But that year in China, Yi Xing invented the first known alarm clock, and the descendants of his contraption ...
Glow-transfer counting tubes, similar in essential function to the trochotrons, had a glow discharge on one of a number of main cathodes, visible through the top of the glass envelope. Most used a neon-based gas mixture and counted in base-10, but faster types were based on argon, hydrogen, or other gases, and for timekeeping and similar ...
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Radioluminescence is used as a low level light source for night illumination of instruments or signage. Radioluminescent paint is occasionally used for clock hands and instrument dials, enabling them to be read in the dark. Radioluminescence is also sometimes seen around high-power radiation sources, such as nuclear reactors and radioisotopes.
For 50 years, Willard was responsible for the periodic maintenance of all clocks at Harvard College in Cambridge, Massachusetts. Additionally, he oversaw Harvard's management of its clocks. Willard presented two clocks to Harvard. One was a tall-case clock; the other was a wall-mounted regulator clock that was installed in a room near ...