Manasara 6.47

6.47

ādau tantuṃ tridhā kṛtvā sūtragrāhīti yojayet
vātāvartaṃ tu sūtraṃ syāttṛtīyāvartadakṣiṇam

having first folded the thread threefold, the surveyor should apply it; / the cord should be twisted like the wind, with the third twist to the right;