Samaranganasutradhara 60.97

60.97

sārdhahastadvayamitaṃ kanīyastadvidhīyate
trihastaṃ jyeṣṭhamaparaṃ madhyaṃ hastasamanvitam

The smallest is prescribed as measuring two cubits and a half. / Another large [type] is three cubits; the medium one is endowed with one cubit [more than the smallest, i.e. two cubits];