Manasara 57.13

57.13

viśāṃśaṃ bāhudīrghaṃ syātkūrparaṃ cārdhamātrakam
prokoṣṭhaṃ ṣoḍaśāṃśaṃ syāttalamaṣṭāṃśamāyatam

The length of the upper arm should be twenty parts, and the elbow half a unit; / the forearm should be sixteen parts, and the palm eight parts long;