Invention took Place in the Middle Age

 Middle age is the time period between 9th Century - 14th  Century. 

This period is also known as Golden Islamic Era . In this era lots of inventions had took place by some of the great inventors. 

Ismail al-Jazari was one of the great mechanical engineer at that time.

Ismail al-Jazari

Born: 1136AD - Died: 1206AD

He was a polymath: a scholar, inventor, mechanical engineer, artisan, artist and mathematician from the Artuqid Dynasty of Jazira in Mesopotamia.

He is best known for writing The Book of Knowledge of Ingenious Mechanical Devices, where he described 50 mechanical devices, along with instructions on how to construct them.

Following are some of its major machineries that he had constructed.

World's first Programmable Humanoid Robot: 

Musical Robot Band 

Al-Jazari created a musical automaton, which was a boat with four automatic musicians that floated on a lake to entertain guests at royal drinking parties.

It has a programmable drum machine with pegs (cams) that bump into little levers that operated the percussion. The drummer could be made to play different rhythms and different drum patterns if the pegs were moved around.

Elephant Clock

The elephant clock described by al-Jazari in 1206 is notable for several innovations. It was the first clock in which an automaton reacted after certain intervals of time. 

In this case, a humanoid robot striking the cymbal and a mechanical robotic bird chirping and the first water clock to accurately record the passage of the temporal hoursto match the uneven length of days throughout the year.

Saqiya Chain Pump

The first known use of a crankshaft in a chain pump was in one of al-Jazari's saqiya machines. 

The concept of minimizing the man power is first implied in one of al-Jazari's saqiya chain pumps, which was for the purpose of maximizing the efficiency of the saqiya chain pump.

Al-Jazari also constructed a water-raising saqiya chain pump which was run by hydropower rather than manual labour. 

Saqiya machines have been supplying water in Damascus since the 13th century up until modern times, and were in everyday use throughout the medieval Islamic world.

Peacock fountain with automated servants

Water and its usages holds particular importance in Islam; both as being an integral part of the pre-prayer washing processes ‘wudu’ and ‘ghusl’, and a key feature in Islamic gardens – four fountains featuring in the Paradise Garden; the Islamic final resting place referenced in the Quran. Machines relating to water held a significant function in both a divine and practical sense

Al-Jazari's "peacock fountain" was a more sophisticated hand washing device featuring humanoid automata as servants which offer soap and towels.

Pulling a plug on the peacock's tail releases water out of the beak; as the dirty water from the basin fills the hollow base a float rises and actuates a linkage which makes a servant figure appear from behind a door under the peacock and offer soap. When more water is used, a second float at a higher level trips and causes the appearance of a second servant figure – with a towel!