[Pramāṇa](https://indike.org/pramana/) › [Physical](https://indike.org/pramana/inp) › [Artefacts](https://indike.org/pramana/inp.artefact) › [Indian Museum, Kolkata](https://indike.org/pramana/inp.artefact.im) › Model of a grinding machine # Model of a grinding machine Model of a grinding machine: Two circular stone discs are placed one upon other. The one disc has three perforations - one large in the middle and two small on two sides of the disc. Three perforations are placed in one line. The other disc has only one perforation at the middle. - **Kind:** artefact --- Source: [https://indike.org/pramana/inp.artefact.im.5963](https://indike.org/pramana/inp.artefact.im.5963) · Pramāṇa