what challenges a farmer has to face in replacing the persian wheel with the tube well?
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Explanation:
What exactly is a Persian wheel? Also known as Rahat (in Urdu), it's a simple water lifting device, where a number of small pots are attached to a long chain. Two gear wheels make up the system and as the first one is revolved, the pots each dip and swallow water from the well and soon after pours itself out to a metallic shaft which in turns empties into an intricate network of troughs that distributes water adequately through the cropped area. It is believed that the technology originated in Egypt and as world shrunk through extensive trading, it spread to India and China. By Amitangshu Acharya Early memories of Persian Wheels originate from lost pages of school geography text books. Passing mention of such systems were largely forgotten as larger and more "important"chapters on Dams were more crucial for both National development and exams. The notion of 'primitive' and 'modern' technology was hammered in at a very early stage. Those hazy black and white pictures acquired depth, colour and meaning in Kolar, where a few remaining systems are still in use. To view Persian wheels, up, close and personal, was embedded in a larger agenda to look into the challenges and threats to such systems today. Its origin in India has a contested history. While some historians point its introduction to the early days of the Delhi Sultanate others pin it on Babur's entry into India. One of the earliest mentions of the Persian Wheel occurs in the Babur's memoirs, the Babur Nama (1526-30). As Islamic rule slowly began to consolidate its regime, there was a remarkable change in governance. One such example of an early State effort in augmenting and incentivising use of farm assets to increase land revenue was by Ala Ud Din Khalji. However, like many of his grand schemes (the most well known being Alai Minar), it fell apart. Later periods, especially under the Mughals, saw increased interest in unifying land revenue systems and land related investment. Protection of farm assets was required and as a result of such patronage, irrigation canals and systems such as Persian Wheels brought about phenomenal changes in agricultural landscape of North India.
Answer:
In the real universe, no black holes contain singularities. In general, singularities are the non-physical mathematical result of a flawed physical theory. ... A singularity is a point in space where there is a mass with infinite density.
Explanation:
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