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TOPIC: BOARD PRACTICE
SUB- TOPIC: Using the Tee and Set Square for Drawing Board; Horizontal and Vertical Lines
Content Development (NOTES FOR SECOND LESSON/PERIOD TWO)
Using the tee and set squares for drawing Lines
This is a practical topic. The teacher should DEMONSTRATE this as much as possible in class for the students
The various uses of setsquares are given below:
Types and Uses of Lines in Technical Drawing
| TYPES OF LINES | THEIR USES |
| Thick continuous line | For visible outlines and edges. |
| Thin continuous line | For dimension lines, projection lines and construction lines. |
| Thin long chain line
|
For cutting and viewing planes as centre lines and path lines for indicating movement |
| Thick continuous wavy line | For short break lines and boundary lines. |
| Thin continuous wavy line | For limits of partial views. |
| Thin ruled line with short zig-zags
|
For long break lines. |
| Arrow heads | Used at the end of dimension lines |
| Thin short dashes | For hidden outlines and edges |
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