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Following the primitive methods of telling time, such as sundials, invented by the Egyptians, and hourglasses, and candle clocks, all created BC, came the Clock Tower, created by Su Sung. Its mechanics were based off the movement of water through the tower, and it tracked the movement of the stars and passing of the hours, however the tower was never completely reliable for telling time. http://www.historyworld.net/wrldhis/PlainTextHistories.asp?groupid=2322&HistoryID=ac08>rack=pthc
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In the 13th Century, several clocks were made and installed in cathedrals. One example would be the clock in Salisbury cathedral, installed in 1386, which still stands today. A good clock would only lose or gain about 15 minutes in a day, and they only measured the hours.
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The next big advancement in the evolution of clocks, would be the creation of domestic clocks, in the 15th century. Previously the Cathedral Clocks had been huge pieces of machinery, but now clocks could be used domestically. These were used by Kings and Nobles who wanted this technology in their own homes.
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The Pendulum clock, usually known as the Grandfather clock, was created based on a discovery made by Galileo, but invented by the Dutch clock maker Christiaan Huygens . This type of clock was much more accurate than it's predecessors, and became very popular in England during the 17th century.
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With the invention of a piece of clock machinery called the hairspring, portable and small, yet functional and accurate clocks, called pocket watches were able to be created, and along with them came another revolutionary thing: the addition of a minute hand to the clock face.
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The chronometer was one of the first clocks with an accuracy comparable to those found nowadays. It was first made by John Harrison for a competition. The aim was to make a clock that could survive the rough conditions of the sea and not lose any more than 3 seconds. These advancements enabled common watches to become cheap and accurate. http://www.historyworld.net/wrldhis/PlainTextHistories.asp?groupid=2324&HistoryID=ac08>rack=pthc
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It's believed that the first wristwatch was made for the Queen of Naples. Wristwatches were usually seen as feminine, and unwanted by men, until the end of WW1, where soldiers were required to wear wristwatches during their service. From then on they gained popularity with the general public, and were seen as a convenient timekeeping device and a status symbol, even in the present time. http://www.theatlantic.com/international/archive/2015/05/history-wristwatch-apple-watch/391424/
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The first clock to run off of an electric current was created by English clock maker Alexander Bain. http://www.historyofwatch.com/clock-history/clock-timeline/
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The first Digital watch was created by the company Hamilton, and cost, $2,100 which is worth about $11,000 in money nowadays. Eventually, they became very cheap, and everyday items, and are still regularly used in the present.
Digital watches read the electrical currents running through quartz crystals to tell time, a highly accurate method. http://www.pcmag.com/slideshow/story/296609/the-digital-watch-a-brief-history
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One of the first cellphones to tell time was the Nokia 6110. People have been beginning to use watches and clocks less and less inthe present, and instead favor checking their phones for the time, which is convenient since we spend a lot of time on our phones nowadays.
http://www.knowyourmobile.com/nokia/nokia-3310/19848/history-mobile-phones-1973-2008-handsets-made-it-all-happen -
The atomic clock reads the vibrations of the cesium-1333 atom, n order to tell time.According to the International system of units, a single second is the duration of 9192631770 vibrations of the cesium atom. This clock is only off by one second every 20 million years, and is the most accurate clock to date.
http://www.time-for-time.com/history.htm
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