The cast-iron coal iron is a hollow body with a hinged lid. The body has a narrowed front part (“nose”) and a straight cut — back part (“nape”). The side walls are straight, vertical. At the bottom, on the border with the thick bottom, both walls have two semi-oval holes-blowholes for air circulation, which ensures the smoldering of coals inside the case. For the same purposes, holes along the edge of the hinged lid, which has a toothed design, also serve. There is a metal bent plate on top of the lid, to which a horseshoe-shaped handle with a wooden handrail is attached.

Iron factory production “LMZ”, the city of Slobodskoy.

The most popular was still an iron with burning coals, which replaced the solid cast in the middle of the XVIII century. It was more difficult to manufacture, which was reflected in its price. The iron was made hollow with side holes (for ventilation, so that the coals were heated better). Red-hot coals (usually birch) were placed inside the case, which had a double bottom (for the convenience of cleaning from ash), and closed with a lid. The convenience of such a design was relative. The iron had to be constantly waved, increasing ventilation. Coals could spill out of the side holes, stain and burn clothes.