Charak Samhita
संस्वेद्य नासामुन्नम्य वामेनाङ्गुष्ठपर्वणा। हस्तेन दक्षिणेनाथ कुर्यादुभयतः समम्॥१०२॥
After proper fomentation, the tip of nose elevated with the thumb of left hand and with the right hand the unctuous errhine should be dropped into the nostril through a tube or gauze, equally into both the nostrils.
english translation
saMsvedya nAsAmunnamya vAmenAGguSThaparvaNA। hastena dakSiNenAtha kuryAdubhayataH samam॥102॥
hk transliteration by Sanscript