Online timer alarm now

Sundial measure time by the sun is widely used in ancient online timer. Nice sundial can measure local solar time rigorously. Permanent sundial as a mechanical  timer alarm performance observation until modern times. However, sundials need sunlight and useless at night, so the need for other techniques for measuring time.

Hour candles and joss sticks at a speed of narrowing the uniform is also used to estimate the passage of time. Hour sand is characterized by fine sand through a small hole at a constant rate as an indicator of the times.
Water  timer alarm
Scale model building Astronomy  timer alarm Tower Su Song built in Kaifeng, China in the 11th century. The  timer alarm is driven by the water wheel, chain drive, and bolosan mechanism.

Besides sundials, water  timer alarms or klepsidra also among the world's oldest instrument time, apart nails and wood vertical shadow tallies the count day.  It was difficult to ensure when and where the first water  timer alarms exist. Hour bowl-shaped water flowing out is the simplest form of water  timer alarms and known to have existed in Babylon and Egypt around the 16th century BC. Evidence of the earliest water  timer alarm is also found in other places such as India and China, but the earliest date use less sure. Some historians write that water  timer alarms appeared in the region as early as 4000.

A Grecian astronomer, Andronicus of Cyrrhus, supervise construction Wind Towers in Athens in the first century BC.  Ancient Greek and Roman Civilization appreciated because they are the first to develop water  timer alarm design to include complex gearing  connected with puppets in addition to increasing  timer alarm accuracy. Progress is passed on to the golden age of Byzantium and Islam before breaking into Europe in the Middle Ages. Meanwhile, the Chinese develop their own water at 725 in M, then extend their ideas to Korea and Japan.
Automatic timer alarm of al-Jazari invention, the 12th century.

In 797 (or 801), the Abbasid caliph of Baghdad, Harun al-Rashid, the present invention that water  timer alarm "so ornate" [5] with an Asian Elephant named Abul-Abbas to the Emperor Charlemagne.
The earliest mechanical  timer alarm

None of the earliest hours late 13th century that still exist in Europe, but fortunately the church records a chance to take a little of the history of such early hours.

Horologia term (from the Greek: ὡρα, at (time), and λέγειν, to tell) was used to designate the type of device that is now an hour, but the use of this word (still there or leave an impression in several languages, Roman) for all types of recorders time concealing the true nature of our mechanism. Example, recorded in 1176 a newspaper that Sens Cathedral installed a 'horologe' but the mechanism is not known. According to Jocelin of Brakelond, in 1198 when a fire at the abbey of St. Edmundsbury (now Bury St Edmunds), the monks 'rushing toward the  timer alarm' to fetch water, indicating that their water  timer alarm also acts as a water reservoir large enough to extinguish the fire at the time