We know that the visual material on a chalkboard is not restricted only to writing. A chalkboard is used for drawing diagrams, stick/line figures, action scenes and pictures. Of all this, we would agree that diagrams are the most frequent drawings on a chalkboard. A diagram is a visual made of straight and curved lines of geometrical figures, unlike a picture, a diagram merely represents something or idea. We may remember the following, while drawing diagrams.
1. Straight and curved lines are the most common components of diagram. So, practice drawing lines of different types at different heights on the chalkboard.
2. It is easier to draw short lines and curves on a blackboard. Practice drawing lengthy lines and curves.
3. Diagrams are accurate and proportionate visual representations. In doing so, lines of different thickness may have to be drawn. Sharpen and shape chalk with the help of blade, knife or sand paper to get desired effect. Holding the chalk at different angles to the board also gives lines of different thickness.
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4. Several types of chalkboard drawing devices are available in the market. They make drawing diagrams easy and accurate. Usually, they are oversized geometrical drawing tools made of wood or plastic.
5. Templates and stencils are other aids for chalkboard drawing. One could make them using hardboard or wood.
6. Even thread can be a useful device in drawing lines, circles and curves on a chalkboard.
7. For enlarging a small diagram on a chalkboard, methods such as use of grid/squares and projection are useful.