The Materia Medica of the Hindus, compiled from Sanskrit Medical Works c4.s4.35

c4.s4.35

दोलायन्त्र. When medicines, tied in a piece of cloth or other material, are suspended and boiled in a pot of water, the apparatus is called *Dolá yantra*. The steam-bath called *Svedana yantra* is got up by covering the mouth of a pot of boiling water with a piece of cloth, placing the medicines to be heated by steam on this cloth, and then covering them with another pot.