Bharatiya Jyotihshastra (History of Indian Astronomy), translated by R. V. Vaidya v2.c12.s5.38
Bhāratīya Jyotiḥśāstra (History of Indian Astronomy), translated by R. V. Vaidya v2.c12.s5.38
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v2.c12.s5.38
∗∗∗ Bhāskarācārya invented a new instrument called the Phalak instrument ; but its origin is to be found in the Cakrayantra itself. Out of the remaining eight, Brahmagupta has not explicitly mentioned the Gola & Nāḍivalaya as seperate instruments. He has, however, mentioned the Golabandha which includes the two. Lalla has not mentioned the Nāḍivalaya out of the eight instruments, but it is included in the Gola itself. It is, however, somewhat surprising that he has not mentioned the Turiya instrument.