1. Sarga.
2.Prati Sarga.
3.Vamsa.
4.Manvanthara.
5.Vamsavali.
Sarga -Creation and Evolution of The Universe.
Prati Sarga-Dissolution and re-Manifestation of the Universe.
Vamsa-Solar and Lunar Dynasties.
Manvanthara-Different Yugas, Aeons.
Vamsavali-Dynaties, other than Solar and Lunar.
This is definition by Amarasimha and others.
An example is the story in the Buddhistic Bhttp://ramanan50.wordpress.com/wp-admin/post-new.phphaisajya-vastu, in which a painter went to the Yavana country and visited the home of a yantracarya, or teacher of mechanical engineering. There he met a machine-girl who washed his feet and seemed human, until he found that she could not speak."( http://www.iskcondesiretree.net)
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Yantras are devices that control the action of elements according to some plan.
According to the Samarangana-Sutradhara, the primary elements that form yantras are called the bijas, or seeds, of the devices'
Vastu-Shastra: Hindu Science of Architecture, by D. N Shukla explains this in detail.
These elements are earth, water, fire, air, and ether. In each yantra, a particular bija element is dominant. For example, we might say that the modern internal combustion engine is a yantra in which earth (in the form of metal) is the bija. The metal is arranged so as to generate energy from fire and air, and the energy is used to propel a vehicle.
The yantras described in the Samarangana-Sutradhara were apparently quite complex. Some of them were made of metal. Some of them are described as svayam vahaka, or self-propelled, with the propulsion mechanism hidden from view.
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