# SwingSuspension Apparatus Water Bath

> SwingSuspension Apparatus Water Bath (Sanskrit: Dola Yantra) is an instrument used in preparation and pharmaceutical equipment. A pot partially filled with liquid with a horizontal rod placed across the rim, from which a muslin bag containing the material to be processed is suspended (hung like a swing/doll - 'Dola') and heated in the liquid below without direct contact with the bottom.

## Key facts

- **Sanskrit name:** Dola Yantra
- **Ayurvedic category:** Preparation and Pharmaceutical Equipment

A pot partially filled with liquid with a horizontal rod placed across the rim, from which a muslin bag containing the material to be processed is suspended (hung like a swing/doll - 'Dola') and heated in the liquid below without direct contact with the bottom.

## Where is it described in the classical texts?

Rasaratna Samuchaya; Rasa Tarangini; Ayurveda Prakasha. Fundamental apparatus in Rasashastra for Shodhana (purification) of metals and minerals.

## How is it used traditionally?

Shodhana (purification) of metals, minerals, and toxic substances through indirect heating. The substance in the hanging bag gets heated by the boiling liquid (often Kanji/fermented rice water, buttermilk, or herbal decoctions) below.

## Traditional materials

- Earthen pot (Mrit Patra)
- Muslin cloth bag
- Bamboo or metal rod
- Jute string

## Modern variants

- Stainless steel water bath with support rod
- Electric heating water baths
- Temperature-controlled Dola Yantra

## Regulatory status

- **India Cdsco:** Not classified as a medical device. Pharmaceutical equipment under AYUSH GMP.
- **Us Fda:** Subject to cGMP requirements for drug manufacturing.
- **Eu Mdr:** Not classified as a medical device.

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Published by Age Ayurveda in the Nighantu. Educational reference only, not medical advice.
Incorporates material from the Amidha Ayurveda Herb Database under CC BY 4.0.