Lettering and Numerals in Technical Drawing – Basic Technology JSS 1
Basic Technology JSS 1 Second Term Lesson Notes – Week 7
Board Practice II: Lettering and Numerals
Subject: Basic Technology
Class: JSS 1
Term: Second Term
Week: 7
Age: 10 – 12 years
Duration: 40 minutes
Behavioral Objectives
By the end of the lesson, students should be able to:
- Define lettering and numerals in technical drawing.
- Identify different types of lettering used in technical drawing.
- Demonstrate proper techniques for writing uppercase and lowercase letters.
- Draw numerals neatly using drawing instruments.
- Apply lettering and numerals correctly in technical drawings.
Keywords
- Lettering – The process of writing letters and numbers in technical drawings.
- Numerals – Numbers used in technical drawings for measurements and labeling.
- Gothic Style – A type of uniform and readable lettering style.
- Vertical Lettering – Lettering style where characters stand upright.
- Inclined Lettering – Lettering style where characters slant at an angle.
Set Induction (Entry Behavior)
- The teacher writes both neatly and poorly drawn letters and numbers on the board.
- The teacher asks students which writing is easier to read and why.
Learning Resources and Materials
- Drawing board
- Drawing paper
- T-square and set squares
- Pencils (HB, 2H)
- Compass and dividers
- Ruler and protractor
- Eraser
Building Background/Connection to Prior Knowledge
Students have learned how to set up a drawing sheet and use drawing instruments in board practice. Now, they will learn how to write letters and numbers neatly in their drawings.
Embedded Core Skills
- Hand-eye Coordination – Ensuring neat and legible writing.
- Creativity – Applying different lettering styles in technical drawing.
- Critical Thinking – Maintaining correct spacing and alignment.
Lesson Content
1. Meaning of Lettering and Numerals
- Lettering: The writing of letters in a neat, standard, and readable way for technical drawings.
- Numerals: The use of numbers to indicate measurements, dimensions, and references in technical drawings.
2. Importance of Lettering and Numerals in Technical Drawing
- Helps in labeling and describing drawings.
- Ensures clarity and readability.
- Maintains uniformity in technical drawings.
- Provides accurate measurements and dimensions.
3. Types of Lettering Styles in Technical Drawing
- Gothic Lettering – Simple, bold, and easy to read.
- Roman Lettering – Decorative and used in artistic drawings.
- Italic Lettering – Slanted letters, used for emphasis.
- Block Lettering – All capital letters with uniform thickness.
4. Types of Lettering Orientation
- Vertical Lettering – Letters stand upright.
- Inclined Lettering – Letters slant at an angle of about 75 degrees.
5. How to Write Technical Letters and Numbers
- Use a sharp HB pencil for clear lettering.
- Maintain equal spacing between letters and numbers.
- Use guidelines to align letters properly.
- Keep letters and numbers at the same height for uniformity.
6. Proper Spacing and Alignment in Lettering
- Use light guidelines before writing letters.
- Ensure equal spacing between letters and numbers.
- Maintain a uniform height for all characters.
Evaluation (Fill in the Blanks with Multiple-Choice Options)
- _______ is the process of writing letters in technical drawings.
a) Lettering
b) Shading
c) Measuring
d) Coloring - _______ is used to indicate dimensions in technical drawings.
a) Eraser
b) Numerals
c) Colors
d) Symbols - A drawing instrument used to ensure uniform letter height is a _______.
a) Compass
b) Divider
c) T-square
d) Protractor - The best type of pencil for lettering is _______.
a) HB
b) 6B
c) 2B
d) 8B - Letters that stand upright are called _______ lettering.
a) Inclined
b) Roman
c) Gothic
d) Vertical - The correct angle for inclined lettering is about _______ degrees.
a) 30
b) 45
c) 60
d) 75 - _______ lettering is used for clear and bold writing in technical drawings.
a) Block
b) Italic
c) Roman
d) Gothic - Numerals are important in technical drawings for _______.
a) Decoration
b) Measurement and labeling
c) Coloring
d) Shading - The standard height for capital letters in technical drawings is usually _______ mm.
a) 1
b) 5
c) 10
d) 50 - A set square is used for drawing _______.
a) Circles
b) Inclined lines
c) Curves
d) Shading
Class Activity Discussion (FAQs and Answers)
- What is lettering in technical drawing?
- Lettering is the process of writing letters in a clear and readable way for technical drawings.
- What are numerals used for in technical drawing?
- Numerals are used for measurements and labeling.
- What are the two orientations of lettering?
- Vertical and inclined lettering.
- Which type of pencil is best for lettering?
- HB or 2H pencil.
- Why is uniform spacing important in lettering?
- To maintain readability and neatness.
- How can we ensure uniform height in lettering?
- By using guidelines.
- What is the main use of block lettering?
- It makes text bold and clear for better readability.
- What is the standard angle for inclined lettering?
- 75 degrees.
- Which tool helps in drawing straight lines for letters?
- T-square.
- Why is neat lettering important in technical drawings?
- It helps in clear communication and prevents mistakes.
Presentation Structure
- Introduction: The teacher writes different types of lettering styles on the board.
- Explanation: The teacher explains the importance of lettering and numerals.
- Practical Activity: Students practice writing letters and numerals using guidelines.
- Guided Practice: Students use drawing instruments to ensure proper alignment.
- Correction & Feedback: The teacher reviews students’ work and provides corrections.
Assessment (Short-Answer Questions)
- Define lettering in technical drawing.
- What are numerals used for in technical drawings?
- List three types of lettering styles.
- Differentiate between vertical and inclined lettering.
- Why is it important to use guidelines in lettering?
- Mention two tools used to draw straight lines in lettering.
- What is the best type of pencil for lettering?
- How do you ensure uniform spacing in lettering?
- State one advantage of using block lettering.
- What is the standard angle for inclined lettering?
Conclusion
The teacher marks students’ work, provides feedback, and emphasizes the importance of neat lettering and numerals in technical drawings.