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The oldest clocks were sundials, which were known in China for the III millennium BC. Shows the location of the clock sundial shadow plate (on the face), a full circle in what phase of rotation of the Earth was.

Veekellas time [http://onlinestopwatchtimer.wordpress.com/ online stopwatch] is the measure of the water tank is full in a permanent flow of water when it is completed. Veekelli was built in ancient Egypt as early as 1500 BC. Temporaaltundidega this custom, according to which the day was divided into night and day, and each of them for 12 hours. Known to length of day and night varies throughout the year, and that's why it was necessary for each water outlet at dawn and dusk to resize the clock to work properly. A few hours veekella cylinder was engraved scale, in addition to the swimming tank osutiks usually the object of which was the location of the water level for better viewing. There were selliseidki veekelli, which showed a direct sense: they put the float in the water tank came flowing, tooth sprocket attached to the bar by moving the pointer. 

Ktesibios veekella improved. He did not like was that the water outlet every morning and evening for manually adjusted, and build the clock to the correct flow rate for each day. S plate was engraved on the [http://onlinestopwatchtimer.wordpress.com online stopwatch timer] rotating cylinder and the cylinder only after it had to be every day of the current day to turn in the appropriate position.

Many places were openly veekell alongside solar and off to their readings can be compared. They are connected to the calendar, and even the wind flags. So, for example, they were connected to the tower of the winds, which donated Kyrrhose Andronikos of Athens.

Plato invented the [http://onlinestopwatchtimer.wordpress.com online timer] alarm clock, which gave rise to the whistle. The evening was filled with adjustable cup water. It came to bowl and was dropping another sunrise around releena acting as a lever. Relay due to a discharged container full of the second, so far it has been drained into the container. Water pressure broke the air whistling through the language, creating a sound. 

The same principle is also used as an egg timer veekellas - sand flows through the tank, through a small hole at the bottom. The total flow into the sand from one vessel to another always takes a long time for the same. Before 16 century found wide use in the sand watches at sea, the churches, the organization of work. Kelli sand has been used more recently, and still used in medicine protseduurikellana, consultations speeches to measure time, to measure time in the kitchen cooking eggs.