The Positive Sciences of the Ancient Hindus c5.s3.t4: Typical Cases of Curvilinear Motion (Gamana)

c5.s3.t4.1

*Vortical Motion.*—This is due to the contact of two bodies moving in opposite directions with a like or equal Vega, *e.g.* two currents of air or water meeting from opposite directions. The change of direction is seen in the fact that water which flows downwards, or air which moves obliquely, may receive an upward motion as the result of such collision. (अथ किमिदं संमूर्च्छनं नाम। समानजयोः (तुल्यवेगयोः) वाय्वोर्विरुद्ध-दिक्क्रिययोः सन्निपातः Praśastapâda, वायुनिरूपणं). The scholiast Udayana adds: वाय्वोरितिप्रकृतत्वेन स्पर्शवत्तोरिति तु विवक्षितम्। अपां यथा द्रव्यान्तर-संमूर्च्छनाद् ऊर्द्धगमनं परस्पराभिहतनदीपयः — उदयन, द्रव्यकिरणावली. Śrîdhara notes: तिर्य्यग्गतिस्वभाव-द्रव्योदूर्द्धगतित्वात् परस्पराभिहत-जलतरङ्गोदूर्द्धगमनवत् असमानवेगयो संमूर्च्छनं न भवति एकेन अपरस्य विनयात् — Śrîdhara.)