Natyashastra
यथाक्षरस्य तालस्य ?? गुर्वक्षरे स्मृतः । यथाक्षरकृतैः पातैस्ताले ज्ञेयो यथाक्षरः ॥ ३८॥
In the Yathākṣara Tāla, the Dhruvā is said to be a long syllable. The Tāla formed with Pātas arranged according to syllables is to be known as Yathākṣara.
english translation
yathAkSarasya tAlasya ?? gurvakSare smRtaH । yathAkSarakRtaiH pAtaistAle jJeyo yathAkSaraH ॥ 38॥
hk transliteration by Sanscript