JSS1 Basic Technology Lesson Note on Basic Freehand Techniques of Drawing Circles; Irregular Shapes

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TOPIC: Freehand Sketching.

 SUB-TOPICS:

1. Basic freehand techniques of drawing circles, irregular shapes etc.

Content Development (NOTES FOR SECOND LESSON/PERIOD TWO)

Sub-Topic II: Technique of Sketching

1. Sketching a Straight line: A straight line is defined as the shortest distance between two points. We can use freehand to draw a fairly straight line by the following procedures.

• Put a dash or dot far enough to the right-hand side of the paper.
• Start to draw a line from the left-hand side to join the dash or dot with your eyes fixed on the point.

2. Sketching a curve: To draw a curve by freehand, it will be necessary to plot some points not too far from each other at different levels, like this ——— with the points in position attempt to draw curves by joining the dashes or dots.
3. Sketching a Circle: To draw circles, the easiest way is to draw lines which are equal in diameter to the circle in different directions. Each line must be as faint and straight as possible, each crossing one another at a central point.  Now, join the points by little curves from the top of each line. Try to draw other circles by means of joining two large curves having half the size as radius and full size in diameter.
4. Sketching a Square Box: This can be sketched in an isometric or oblique view. Isometric views have the vertical height and the base lines included at 45⁰ to the horizontal while the second base line is horizontal.  Once it is decided which view to represent, the block is drawn by using a series of straight lines both vertical and horizontal, applying the techniques discussed earlier.
5. Sketching an Irregular Edge –

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