About Chalk Boards

1. About Chalk Boards

2. 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

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

4. The Origins Of The Chalkboard The 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

5. 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.

6. Revolutionary War Era Revolutionary 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.

7. A Variety Of Learning Aids On 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.

8. The Reading Chalk Board Eventually 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

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

10. The Early Chalkboards The 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.

11. 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.

12. 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

13. Surface Of A Chalkboard The 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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