The diagrams below show stages in the development of simple cooking equipment.
Summarise the information by selecting and reporting the main features, and make comparisons where relevant.
The three diagrams illustrate the process of improving a cooking device. It is a clear and coherent representation.
Overall, it is evident that there are three different stages in the process, from the initial simple fire to complex equipment, which is used for cooking.
At the first stage, there was simple cooking equipment: pot, which was balanced by three stones over a fire of twigs and grass. In the second diagram, the same material was used with a shield which was made of clay, around the fire. It was probably used to prevent the loss of heat, and protect the fire from wind.
In the final stage, there were many tools which were used for cooking. Fire is enclosed by a metal base; which is used to control the heat. The inner lining of the pot is made of clay. There is a door at the front where air can enter and ash can be removed. Charcoal is used as fuel. There is also metal support and with its help, the pot can be balanced on the stove, and it also has a handle for easy transportation.
