Anandakanda 1.26.94

1.26.94

yasminnipatati sūtaḥ proktaṃ tad dīpikāyantram /
<29. gaṅgāsāgara(bhaṭṭī)yantram>
dvādaśāṅgulamutsedhaṃ ṣoḍaśāṅgulamāyatam //

that in which quicksilver falls down is called the lamp apparatus (dīpikāyantra).
<29. The Gaṅgā-Ocean [Distillation] Apparatus (gaṅgāsāgara[bhaṭṭī]yantra)>
Twelve finger-breadths in height and sixteen finger-breadths in width,