Rasendracudamani 13.42

13.42

tāvanmātraṃ ca kāntāyaḥ sarvaṃ vāritaraṃ kṛtam /
aṣṭamāṃśaśca sūtasya sarvebhyaḥ parikīrtitaḥ //

the same amount of lodestone, all made floatable on water;
and an eighth part of mercury with respect to all is prescribed;