Changes

The main yantras of warfare are discussed by Kautilya in the Ayudhagara adhyaya wholly devoted to armoury. However, other mechanical contrivances described by him pertain to construction of forts with restrictive secret passages, movable staircases, controlling animals like elephants, for protecting against unwanted intruders in many situations.   

The main yantras of warfare are discussed by Kautilya in the Ayudhagara adhyaya wholly devoted to armoury. However, other mechanical contrivances described by him pertain to construction of forts with restrictive secret passages, movable staircases, controlling animals like elephants, for protecting against unwanted intruders in many situations.   

In II. 5, he refers to a dugout, ''Bhumigriha,'' and mentions for it a mechanical staircase which can be thrown in and withdrawn ( ''Yantra-yukta-sopdna).'' While detailing the exact methods to be adopted for finishing off enemies and unwant- ed persons (XII. 5), Kautilya speaks of machines which could be conveniently pressed into service. When the unwanted person is entering a temple, from an overhead yantra there could be released on his head a piece of masonry or a stone to kill him instantly.  

In II. 5, he refers to a dugout, ''Bhumigriha,'' and mentions for it a mechanical staircase which can be thrown in and withdrawn ( ''Yantra-yukta-sopdna).'' While detailing the exact methods to be adopted for finishing off enemies and unwanted persons (XII. 5), Kautilya speaks of machines which could be conveniently pressed into service. When the unwanted person is entering a temple, from an overhead yantra there could be released on his head a piece of masonry or a stone to kill him instantly.  

== Yantras for Water-lifting ==

== Yantras for Water-lifting ==