Blackboard essay in english

The bottom edge of the blackboard should be 3 feet above the floor on which the teacher stands. There are many varieties of a blackboard: This is the most widely used and economical type of blackboard.

It is usually hung on the wall or on a stand and its uses are the same as a wall blackboard. However, its advantage is that it can be moved from one place to another. Besides, a teacher can write teaching-learning material and prepare a roll-up board in advance before coming to class.

It should be painted in black every year so as to maintain the quality of its service. It should ideally be used as a supporting arrangement rather than the main one. It is usually hung on the wall or on a stand and its uses are the same as a wall blackboard.

It is an improvisation over the wall-black-board but is more expensive. However, just like a wall blackboard, it is immovable. This is, as the name suggests, green in color, easy to use and maintain, made of glass and more commonly used type of board these days.