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Uses of Blackboards

10/8/2012 12:57:00 PM | by Anonymous

Blackboards

Also known as a chalkboard, blackboards have been around since the early nineteenth century and are a type of reusable writing surface. Chalk sticks, which are usually made of calcium sulfate or calcium carbonate, are used to write on the surface of the blackboard. The writings made by the chalk sticks are erasable and thus the blackboard can be reused several times. The evolution of blackboards is evident, with the first form of blackboards being small slates that were used by students in schools to do their writing on. With advances, the sizes of the slates were increased from which blackboards were born. Using the blackboards, a teacher in a classroom did not have to go around the entire classroom writing the problem on every student’s slate, but instead could simply write the problem on the blackboard which is located at the front of the classroom for everyone to copy. Traditional blackboards were black in color. However, modern blackboards are usually green as the color is considered easier on the eyes. Also, these boards were originally made of thin, smooth sheets of black or dark grey slate stone. This material was most ideal as it allowed for easy writing. Also, the chalk can be easily erased off on this material, allowing the blackboard to be used over and over again.

 

From their inception to modern day chalkboards, blackboards have seen several changes and advances in the way they are produced as well as the chalks that are used for writing on them. The invention of blackboards came about as paper was too expensive in the olden times and it would be impractical to use them only once as they could be reused several times. Today, blackboards are composed of highly engineered materials that allow for easy writing and erasing. Also the chalks that are used to write on blackboards have went through several advances. Today, many chalk manufacturers produce one that are dustless which can also be available in multiple colors. The highest grades of blackboards are usually made of a rough version of porcelain enameled steel available mostly in green or black and sometimes in other colors as well.

 

An issue that most people might face when using blackboards can be erasing the chalk marks off. Although the marks usually come off easily, they sometimes may be difficult to be erased off and may stain the chalkboard. Also, a new chalkboard would usually catch marks of the chalk which may be difficult to get rid off. It is, therefore, most manufacturers advice that the blackboard be fully covered with the chalk which should then be erased off, to prepare the chalkboard for use. The writings of the chalk can be erased off with a damp cloth or a blackboard eraser which usually consists of a block of wood that has a felt pad on one side to erase the writings.

 

The use of blackboards in many developed countries is starting to diminish, with alternatives such as whiteboards or projectors. Whiteboards are similar to blackboards, with the difference being that whiteboards make use of markers to write on the board instead of chalk. As markers are used, the material used to compose whiteboards is different. As for projectors, these devices make use of 21st century technology to project the writings on a screen usually located at the front of the classroom. Although the use of blackboards in schools has started to diminish, many establishments such as public houses and cafes still make use of these materials as a medium of advertising or announcing any promotions or the menu for the day. Colorful chalks are typically used for writing on such boards to make them more attractive, so that they can grab the attention of passers-by and promote the day’s promotion. Chalkboards offer several advantages to people that despite the several advances in technology, these materials continue to thrive to be used all around the world.

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