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The first ever hour glass or sand clock was invented by a French monk called Liutprand. It measures time by the descent of sand from one glass bulb to another.
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Other regions of the world, including India and China, also have evidence of water clocks, but the earliest dates are less certain. Some authors, however, claim that water clocks appeared in China as early as 4000 BC.[2]
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The Romans adopted the Greek sundials, and the first record of a sun-dial in Rome is 293 BC. The ancient Greek actually had many forms of sun-dials.The earliest sundials were known as shadow clocks.
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The Gregorian calendar was introduced as a refinement of the Julian calendar in 1582.The Roman calendar was reformed by Julius Caesar in 45 BCE.
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The advantage of a pendulum for timekeeping is that it is a harmonic oscillator; it swings back and forth in a precise time. Everyone used pendulum clocks along with some people in the 21rst century.
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An alarm clock is a clock that makes a sound or signal at a specific time. Some use sound while others use light or vibration.
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The first ever words spoken on the first telephone were spoken by Alexander Graham Bell. He was the inventer of the telephone, and he made the first call on March 10th,1876, to his assistant, Thomas Watson. Those first words were, " Mr. Watson--come here--I want to see you."