The diagram illustrates how cooking equipment has evolved including various stages.
Overall, the changes are depicted across three main phases: A, B, and C; showcasing the transition from the primitive materials to sophisticated and modern designs. These phases rely on stone, clay and metal respectively, as the foundation materials for the equipment.
Initially phase A, cooking utensils were created from stone, featuring a long cylindrical pot with a narrow neck and a small top opening.
Phase B demonstrates a significant improvement, with the cooking shield of clay. It helps retain heat for an extended period and protect the fire from wind and water. The cooking equipment is operated using stones and twigs to ignite the fire.
The major development occurs in phase C, the cooking device crafted from diverse raw materials with many cutting-edge functions . It includes a clay lining inside, a grate for charcoal to improve airflow and combustion, and a door to add fuels and remove air. Additionally, there are also handles to facilitate transportation, and designated air and ash outlets to control heat and cleanliness.