![]() Enameled boards are more expensive and less used in commercial environments, but in more demanding environments with heavier use, such as educational establishments, porcelain boards are considered superior. Enameled whiteboards, also referred to as porcelain and sometimes glass boards, have the advantage that markings can be erased completely other materials tend to become stained over time. Cheaper versions were then produced, including laminated chipboard, high-pressure laminates and steel boards with a matte-finished or glossy white, usually polyester or acrylic, coating. The first whiteboards were very expensive and were made of an enameled steel. By the late 1990s, about 21% of American classrooms had converted from chalkboards to whiteboards. They became more common in classrooms during the 1990s due to concerns over health problems in children with dust allergies and the potential for chalk dust to damage computers. Whiteboards began being commonly used by businesses in the early 1990s. ![]() Dry-erase markers for whiteboards were invented in 1975. ![]() ![]() Early whiteboards needed to be wiped with a damp cloth and markers had a tendency to leave marks behind, even after erasing the board. Whiteboards became commercially available in the early 1960s, but did not become widely used until 30 years later. Door sign to the offices of Magiboards at The Cut in Waterloo, London, in 1966. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |