The diagram represents the stages in the development of simple cooking equipment in three different stages.
Overall,there are three stages in the process beginning with stone and making of equipment.
To begin with,stone is made in the shape of a pot with basement clay shield for protection.Stone is well fitted into the clay shield. On the other hand,the sub stages have handle made of metal as base element.However, the heat air produced is outletted by the base part.The support element for the pot attached on clay lining.The top most layer is clay lining.The grate for charcoal mixture is the substance used for cooking food.
Furthermore ,all the three stages showed how a stone made of clay can be useful and how heat produced from the equipment for cooking food. Therefore,process has from stone structure to a more complex and efficient design, highlighting improvements in functionality, stability, and heat management.