About Chalk Boards

A Piece Of Chalk

The chalkboard is a flat, vertical writing surface on which anything can be inscribed by means of a piece of chalk. The device is generally used for educational purposes, but it can also be found in the workplace

A Variety Of MaterialsWhile chalkboards can be manufactured from a variety of materials, porcelain enamel is the most common material used in today's chalkboard.

The Origins Of The ChalkboardThe origins of the chalkboard date back to the early decades of the 19th century. The forerunner of the chalkboard was the small, paddle-shaped hornbook

Use In Schools

This item had been in use in schools of medieval England, and by the time of the Revolutionary War era in colonial America, it was chalk board carried by legions of students.

Revolutionary War EraRevolutionary War era in colonial America, it was carried by legions of students. The hornbook was a strip of wood with a piece of paper fastened onto it.

A Variety Of Learning AidsOn the paper were a variety of learning aids in small print. A typical hornbook would carry both the Lord's Prayer and the alphabet, and a translucent sheet of animal horn covered the paper.

The Reading Chalk BoardEventually the hornbook evolved into the reading board. This was a strip of about 15 inches (38 cm) in length, also containing the alphabet and other learning aids

Chalkboard For All StudentsFrom the reading board came the concept of one general chalkboard for all students in the classroom to both view and use

The Early ChalkboardsThe early chalkboards were simple pine boards painted black. In other cases, a combination of lime, plaster of Paris (a white powdery substance), and lampblack (fine black soot) chalk board was spread on the classroom wall.

Most Modern Chalkboards

Most modern chalkboards are made of porcelain enamel. In this particular manufacturing process, a tough and durable material such as steel is used as the base.

Manufacture Of Chalkboards

There are several thicknesses of steel used in the manufacture of chalkboards, but the most common is 22-gauge. Another crucial element is silica

Surface Of A ChalkboardThe surface of a chalkboard is usually a blend of inorganic compounds such as a powdered glass opacifier and oxides, an organic element that provides color to the coating material.

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