Question

introduction on olden times of clocks

Answer 1

For thousands of years, devices have been used to measure and keep track of time. The current  system of time measurement dates to approximately 2000 bcfrom the Sumerians.
The Egyptians divided the day into two 12-hour periods, and used large obelisks to track the movement of the sun. They also developed water clocks, which were probably first used in the Precinct of Amun-Re, and later outside Egypt as well; they were employed frequently by the Ancient Greeks, who called them clepsydrae. The Zhou dynasty is believed to have used the outflow water clock around the same time, devices which were introduced from Mesopotamia as early as 2000 bc.
Other ancient timekeeping devices include the candle clock, used in ancient China, ancient Japan, England and Mesopotamia; the timestick, widely used in India and Tibet, as well as some parts of Europe; and the hourglass, which functioned similarly to a water clock. The sundial, another early clock, relies on shadows to provide a good estimate of the hour on a sunny day. It is not so useful in cloudy weather or at night and requires recalibration as the seasons change (if the gnomon was not aligned with the Earth's axis).
The earliest known clock with a water-powered escapement mechanism, which transferred rotational energy into intermittent motions,[1] dates back to 3rd century bc in ancient Greece;[2] Chinese engineers later invented clocks incorporating mercury-powered escapement mechanisms in the 10th century,[3] followed by Iranian engineersinventing water clocks driven by gears and weights in the 11th century.[4]
The first mechanical clocks, employing the verge escapement mechanism with a foliot or balance wheel timekeeper, were invented in Europe at around the start of the 14th century, and became the standard timekeeping device until the pendulum clock was invented in 1656. The invention of the mainspring in the early 15th century allowed portable clocks to be built, evolving into the first pocketwatchesby the 17th century, but these were not very accurate until the balance spring was added to the balance wheel in the mid 17th century

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new points
Today we take knowing the time and the day of the year for granted but for our ancestors it was far more difficult. Until mechanical clocks were invented in the 13th century there were various ways of telling the time.
The earliest method of telling the time of day was the sundial. It is not known when the sundial was invented but they were certainly used in Ancient Egypt and Ancient Iraq. They are also mentioned in the Old Testament. Other ancient civilizations such as the Greeks and the Romans also used sundials. Over time sundials gradually became more accurate and they remained a common way of telling the time until the early 19th century.
About 1400 BC the Egyptians invented the water clock. It consisted of two containers of water, one of which was higher than the other. Water flowed along a tube from the higher container to the lower at a steady rate. Rings were marked on the inside of the lower container and when the water level reached one it meant another hour had passed.
The Saxons used a candle clock. A candle was divided into segments and it took an hour for each segment to burn