The given diagram gives information about how lead pencils are manufactured. It is evident that the process consists of several steps, commencing with planting the tree seeds and ending with packaging the complete lead pencils.
In the first stage, seeds of the tree used in making the pencil’s wood case are sown into the ground for four months before being replanted in larger areas. Three years later, the trees grow and are thinned, and they are chopped down after 14 years. Afterwards, they are sawn into thin slats in a machine and treated for 60 days.
In the following step, the treated slats will have glue and black leads applied onto them, creating grooves in the process. Following this, a blank slat is placed on top of each newly processed slat, forming sandwiches. These sandwiches are then hard-pressed with heat and cut into pencils.
The final procedure has the cut pencils painted, sharpened, and stamped. Once they are ready, the pencils are packaged in boxes, ready for sale.