who has devloped the yasti - yantra device which is used -

Stick Machine of Bhaskaracharya This machine was known as Yasti Yantra This machine has been also described by mathematicians like

Yasti Yantra was developed by Bhaskaracharya and has also been refered to as Dhi Yantra The same type of instrument has also been described by

royal yantra coupon Yantra Adhyay' is devoted to methods for the construction of astronomy Bhaskara, Brahmagupta and several others Yasti Yantra: Another simple

raja rani bengal yantra Cakra yantra - wheel or circle 4 Yaṣṭi yantra- apole or staff instrument 5 Śaṅku yantra- Gnomon 6 Ghaṭikā yantra