Rasendracudamani 5.4

5.4

saṃdhānapūrṇakumbhāntaḥ pralambanagatisthitām /
adhastājjvālayedagniṃ tattaduktakrameṇa hi /
dolāyantramidaṃ proktaṃ svedanākhyaṃ tadeva hi //

suspended inside a jar filled with fermented liquid,
one should ignite a fire beneath according to the specified rule.
This is declared to be the swing apparatus (dolāyantra), and it is indeed called the sweating apparatus.