What is the board history?

Our modern daily boards, with their greenish occupation and dust -free chalk, have gone through many stages of evolution. Initially, the boards were only small squares of slate, framed by wood to prevent them from breaking and marked with other shale shards. At the beginning of the 19th century, America was widely used in public schools because the paper was too expensive. The earliest record in America shows instructors who use them in academic military schools, such as Westpoint in 1801. Teachers no longer spend so much time writing individual problems and a less student lesson but could talk to the whole class where everyone had an advantage. Maine, Pennsylvania, Virginia, Maryland and New York. It could then be transported through the railway to thousands of prairie schools that appear across the border in the 1840s.

In the 1950s, most of the one -room school houses were equipped with staples: wood, benches and large boards. In poorer or more distant schools, teachers can resort to plaster wall painting or dark panel with dark color to mimic slate. An old rag served as a rubber. Every school could now accommodate more students and teach them more efficiently.

The basic tool was somewhat modernized. Probably we will find a board that is in today's classroom enamelled steel leaf with an enamelled porcelain. Also, the pieces of slate were replaced by chalk, which is white limestone mined from the ground. Of course, the rags of the rags were replaced by felt, which could erase chalk marks without creating so much airy dust. Despite all these changes, however, the table remains the top of the classroom.

In the 90s of the 20th century, concerns about allergies and other potential health risks that represent the Cretaceous dust, replacing many boardstabs. The bleached board is a plastic plate, otherwise known as a dry erase board, which uses special pens to make colored brands. They can be a cleaner and clearer alternative to education and business interests.