Bharatiya Jyotihshastra (History of Indian Astronomy), translated by R. V. Vaidya v2.c12.s5.17

v2.c12.s5.17

∗ This description has been given from the chapters on Golabandha and Yantras (istruments). If an attempt be made to describe in detail the instruments along with an explanation of their names, such as Nāḍīvalaya, and other terms, much space will be occupied, and even with all that, it is very difficult to present a description that would enable one to understand them properly without actually seeing them. Hence, only a brief description has been attempted. These however, will help even a layman to understand well the chapters on Golādhyāya and Yantrādhyāya by Bhāskarācārya. If all these instruments are made in the Chhatre memorial scheme, they will prove very useful at a moderate cost.