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Many measurement systems appeared. While the sundial appeared since the beginning, other methods are: the observation of the stars, sand and water clocks and other devices like pocket watches with varying success are part of a tour that has continued to this day. All clocks run following a similar principle, which is to have a regular cycle that allows us to measure time. In other words, the time measurement is the comparison of a fixed event with other usually unknown. Stonehenge In antiquity it was used as a reference point for timing of natural events, such as time of day or stargazing. Sometimes the measure was not intended to determine the time of day but showed certain events of interest to our ancestors, such as the solstices (Stonehenge). Other pocket watches instead of focusing on an external event using its own mechanism with a constant duration, one of the first devices of this type was created by the Egyptians some 1400 years BC, and is called clepsydra or water clock, the principle is that a given quantity of water always requires the same time to pass drop by drop from one container to another. This mechanism was later refined by other cultures such as China or India. These watches were still used in increasingly sophisticated ways for centuries. The Egyptians used water clocks as well as sundials to measure time; one of these watches dating from the eighth century BC is still preserved in Egypt. Other civilizations used ingeniously simple objects, so for example the Chinese civilization was burning a knotted rope regularly and observed the length of time required for the fire to travel from one node to the next. The mechanical pocket watches appeared in the thirteenth century, being quite inaccurate and often bulky. The first references appear in books of Alfonso X the Wise, but subsequently celebrities like Leonardo da Vinci contributed in one way or another to the development of more accurate mills to time. Then came the first motor clocks were based on the use of weights. The portable clocks appeared in the fifteenth century with the invention of the spring motor. By analyzing how this works, you are one step closer to find what you want. The more you look the better it is. While these pocket watches are not like wrist models, note that you will be wearing it, too. You may need to take it out from your pocket to look at the time. A matching style would be much more suitable!
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