Anandakanda 1.26.93

1.26.93

tatra pātālayantre tu sūtakādi nipātayet /
<28. dīpikāyantram>
kacchapayantrāntargatamṛṇmayapīṭhasthadīpikāsaṃsthaḥ //

one should cause quicksilver and the like to distill downwards in that subterranean apparatus (pātālayantra).
<28. The Lamp Apparatus (dīpikāyantra)>
Placed within a tortoise apparatus (kacchapayantra), resting upon a small lamp that stands on an earthen pedestal,