Anandakanda 1.26.8

1.26.8

adhastād droṇikā kāryā vahniprajvālanocitā /
utsedhena navāṅgulaḥ khalu kalātulyāṅgulāyāmavān vistāreṇa navāṅgulo rasamitair nimnaistathaivāṅgulaiḥ /
kaṇṭhe dvyaṅgulavistaro'timasṛṇo droṇārdhacandrākṛtir gharṣaścaiva daśāṅgulaśca tadidaṃ khalvākhyayantraṃ matam //

A small trough suitable for kindling fire should be made underneath.
Nine fingers in height, indeed sixteen fingers long, nine fingers wide, and likewise six fingers deep,
two fingers wide at the rim, extremely smooth, shaped like a trough or a crescent moon, and with a pestle ten fingers long—this is considered the apparatus called a mortar.