Pencil making

The following diagram shows how pencils are manufactured.

Summarise the information by selecting and reporting the main features,and make comparisons where relevant.

This diagram illustrates the production of pencils,which consists of two manufacturing departments.

According to the diagram the pencil leads are made of ground graphite,clay and water.All component are mixed into the graphite dough.This mixture is poured into a forming press which makes a graphite rod.Then the rod is cut into pencils leads and left to dry.Once they are dry,the leads are put into an oven and heated to a temperature of 800C.The next stage of pencil making is the preparation of pencil cases.The diagram shows that wooden bars are sawed into thin slats.Then,the grooves are cut in each slat,into which the cool leads are inserted.Both,the wooden parts and the leads are covered with glue and then another slat is mounted on them which contains grooves.This "sandwich" of slats is sawed into sticks,which are smoothed and shaped by a shaping machine.Finally,as fast as the machine creates smooth finishes,the pencils are ready to use.