Concept in Definition ABC

The pencil is he most popular element when it comes to drawing and to writeTherefore, it turns out to be a basic and highly necessary implement for students of different subjects, since at From there they can make annotations of the classes they attend and then review the contents learned.

Generally, it is made of a graphite rod contained within a cylinder of wood or metal.

The origin of this element dates back to the century XVII in England where a very important deposit of graphite was discovered. Although England for many years dominated the business of manufacturing pencils, the emergence of a brand new method by which graphite powder could be achieved, expanded the Commerce of the same. Meanwhile, it would be in Italy where the idea of ​​adding a wooden support to graphite pencils would arise.

Towards the middle of XIX century a rubber is created that is used as an eraser to be added to the opposite end of the pencil; a design which by the way until today is extremely practical to immediately erase that error incurred in the

writing or in the He drew.

Today pencils are made by combining graphite powder with ground clay. Water is added to the mixture, which will form elongated mines that are then cooked in the oven. The result is dipped in wax or oil which is what will give a smooth finish to the writing. Next, a cedar plank is cut to make a lath and the clay and graphite strips are inserted into it. One more plank of appearance Corrugated will be placed on the surface and finally varnished or painted.

There is a system of classification of pencils that measures their hardness and their dark coloration. The letter H designates the hardness, while the B the degree of darkness they present.

Pencil Themes