Mainly it was used for causing the chemical to perspire by exposing them to medicated steam.
Procedure: In this yantram, a vessel filled with some liquid substance to half of its capacity is taken. Two holes are made opposite to each other near the mouth of the vessel. Then a rod is arranged through the two holes across the mouth. A bundle containing the material which is boiled is suspended into the liquid by tying it at the middle of the rod. Then the vessel is heated as required.