It is a vat about six to seven feet in diameter by eighteen inches in length. There is a double bottom in the interior of this vat, in which fragments of broken bottles, gravel, stones, and sticks of pounded sulfur and iron filings are placed. All of this is filled with water and covered up with a floor nailed to the vat. On the surface of the lid, six inches in from the rim, one makes various boles in order to allow the passage of iron rods which are arranged so that one end penetrates the bottom of the vat and the other is directed, by means of a curve, over the pit of the stomach of the patient of other affected parts of the body.