Care and Maintenance of Drawing Instruments – Basic Technology JSS 1
Basic Technology JSS 1 Second Term Lesson Notes – Week 5
Drawing Instruments and Materials (II): Care
Subject: Basic Technology
Class: JSS 1
Term: Second Term
Week: 5
Age: 10 – 12 years
Duration: 40 minutes
Behavioral Objectives
By the end of the lesson, students should be able to:
- Explain the importance of taking care of drawing instruments and materials.
- Identify proper ways to maintain and store drawing instruments.
- Demonstrate the correct handling of various drawing instruments.
- Discuss the effects of poor maintenance on drawing instruments.
Keywords
- Maintenance – Keeping instruments in good condition.
- Storage – Properly keeping instruments to prevent damage.
- Lubrication – Applying oil or grease to prevent rust.
- Sharpening – Keeping pencils and compasses sharp for accuracy.
- Cleaning – Removing dirt to maintain function and durability.
Set Induction (Entry Behavior)
- The teacher displays various drawing instruments and asks students to observe their condition.
- The teacher asks students if they have ever lost or damaged a drawing instrument and how it affected their work.
Learning Resources and Materials
- Real samples of drawing instruments (e.g., T-square, compass, set squares, and protractor).
- A dirty and well-maintained drawing instrument for comparison.
- Cleaning tools (soft cloth, eraser, pencil sharpener).
Building Background/Connection to Prior Knowledge
In the previous lesson, students learned about types of drawing instruments and their uses. This lesson will teach them how to care for and maintain these instruments.
Embedded Core Skills
- Critical Thinking – Understanding the effects of poor maintenance.
- Collaboration – Group discussions on instrument care.
- Communication – Explaining maintenance procedures.
Lesson Content
1. Importance of Taking Care of Drawing Instruments
Proper care of drawing instruments ensures:
- Accuracy in drawing.
- Durability and long lifespan.
- Prevention of rust, breakage, or damage.
- Clean and neat drawings.
2. Ways to Care for Drawing Instruments and Materials
| Instrument/Material | Care and Maintenance |
|---|---|
| T-square | Store flat to prevent bending and clean with a dry cloth. |
| Set Squares | Keep in a case or folder to prevent scratches. |
| Compass | Wipe after use, tighten loose parts, and store properly. |
| Protractor | Store in a protective case and avoid dropping. |
| Drawing Board | Keep dry, clean regularly, and avoid rough handling. |
| Ruler | Clean with a dry cloth and store in a case to prevent bending. |
| Eraser | Keep dry and avoid exposure to dirt. |
| Pencils | Store in a pencil case and sharpen properly. |
| French Curve | Store in a protective cover to avoid breaking. |
| Dividers | Keep sharp, clean, and free from rust. |
Evaluation (Fill in the Blanks with Multiple-Choice Options)
- Proper care of drawing instruments helps to improve _______.
a) Accuracy
b) Dirtiness
c) Damage
d) Breakage - A set square should be kept in a _______.
a) Dirty place
b) Case or folder
c) Dusty bag
d) Water container - A compass should be wiped after use to prevent _______.
a) Rust
b) Brightness
c) Drawing
d) Measuring - The best way to store a T-square is to keep it _______.
a) Flat
b) Folded
c) Bent
d) Rolled - A protractor should be handled with care to prevent _______.
a) Scratches
b) Accuracy
c) Rust
d) Neatness - If a ruler is bent, it can affect _______.
a) Straight lines
b) Pencils
c) Erasing
d) Measurements - Pencils should be stored in a _______.
a) Wet place
b) Pencil case
c) Fire
d) Water - The main reason for keeping a drawing board dry is to prevent _______.
a) Swelling and damage
b) Color change
c) Sharpness
d) Rust - The best way to store dividers is to keep them _______.
a) Sharp and rust-free
b) Rusty
c) Unclean
d) Loose - An eraser should be kept away from _______.
a) Dirt and moisture
b) Paper
c) Pencil
d) Books
Class Activity Discussion (FAQs and Answers)
- Why should we care for drawing instruments?
- To ensure accuracy, durability, and neat drawings.
- How should a T-square be stored?
- It should be kept flat and wiped clean after use.
- What happens if a set square is scratched?
- It may not give accurate angles.
- Why should we keep a compass free from rust?
- Rust makes it difficult to use and may stain paper.
- How should a drawing board be cleaned?
- Wipe with a dry cloth and keep in a dry place.
- Why should an eraser be kept dry?
- A wet eraser can damage paper and reduce its effectiveness.
- How do we maintain a French curve?
- Keep it in a case to prevent breaking.
- Why should we sharpen pencils properly?
- To ensure clean and precise lines.
- What should be done if a protractor gets scratched?
- Handle carefully and replace if necessary.
- Why is it important to store dividers safely?
- To keep them sharp and prevent rust.
Presentation Structure
- Introduction: The teacher displays clean and poorly maintained drawing instruments.
- Discussion: The teacher explains how to care for each instrument.
- Student Participation: Students demonstrate how to clean and store drawing tools.
- Correction & Explanation: The teacher corrects misconceptions and reinforces key points.
Assessment (Short-Answer Questions)
- Why is it important to maintain drawing instruments?
- What are two ways to take care of a compass?
- How should a ruler be stored?
- What can happen if a drawing board is exposed to moisture?
- Mention two instruments that should be kept free from rust.
- What is the best way to store a set square?
- Why should an eraser be kept clean?
- How can we prevent a T-square from bending?
- What happens if a pencil is not properly sharpened?
- What is the best way to store a French curve?
Conclusion
The teacher marks students’ work, provides feedback, and emphasizes the importance of caring for drawing instruments to ensure accuracy and durability.