JSS 3 BASIC TECHNOLOGY FIRST TERM SCHEMES | WEEK 2 SCALES SCALE DRAWING
LAGOS STATE GOVERNMENT MINISTRY OF EDUCATION
UNIFIED SCHEMES OF WORK FOR JUNIOR SECONDARY SCHOOLS
JSS 3 BASIC TECHNOLOGY FIRST TERM
WEEK 1
REVIEWING OF PREVIOUS TOPICS / WELCOME TEST
By the end of the lesson, students should be able to: Identify areas of their weaknesses
WEEK 2
SCALES AND SCALE DRAWING
- Definition and types of scale
- Simple scale drawing
By the end of the lesson, students should be able to:
Explain the meaning of scale in relation to drawing.
Highlight types of scale
Differentiate between various types of scales
Draw objects to given scales (Enlargement and Reductions)
WEEK 3
DRAWING PRACTICES (ISOMETRIC DRAWING)
- Definition of Isometric drawing
- Drawing of simple Isometric blocks
By the end of the lesson, students should be able to:
State the meaning of Isometric drawing
Identify Isometric drawings
Draw Isometric blocks with drawing instruments
WEEK 4
DRAWING PRACTICES (ISOMETRIC DRAWING)
- Definition of Isometric drawing
- Drawing of simple Isometric blocks
By the end of the lesson, students should be able to:
State the meaning of Isometric drawing
Identify Isometric drawings
Draw Isometric blocks with a drawing instrument
WEEK 5
DRAWING PRACTICE (OBLIQUE DRAWING)
- Definition and types of oblique drawing
- Drawing
By the end of the lesson, students should be able to:
Explain the meaning of oblique drawing
Differentiate between various types of oblique drawings
Draw simple oblique blocks with a drawing instrument
WEEK 6
PERSPECTIVE DRAWING
- Definition and types of perspective drawing
- Drawing of a simple one-point perspective
By the end of the lesson, students should be able to:
Give the meaning of perspective drawing
Differentiate types of perspective
Draw a simple perspective drawing
WEEK 7
CONTINUOUS ASSESSMENT/MID-TERM BREAK
Week 8
ORTHOGRAPHIC PROJECTION
Definition of angles of projection (1st and 3rd angle)
Drawing of an orthographic projection of simple blocks
Dimensioning technique
By the end of the lesson, students should be able to:
Define orthographic projection
Highlight and example
Types of projection
Draw an orthographic projection of simple blocks in 1st and 3rd
WEEK 9
SIMPLE BLUE PRINT
Definition
Common symbols of building plans and their interpretation
By the end of the lesson, students should be able to:
Define blueprint
Demonstrate and explain blue blueprint
WEEK 10
DOMESTIC PLUMBING (PLUMBING tools)
Types and uses of Adjustable spanner, Pipe wrench, try square, Spirit level, Pipe cutter, Pipe bender, Bosom hammer, Wiping cloth, Mallet hack saw, Chisel, etc. By the end of the lesson, students should be able to:
Differentiate between common Plumbing tools
Highlight their uses
WEEK 11
PIPELINE FITTING AND SANITARY
Appliances in cold water supply types
Stock cock, Values, Gate valves, Taps, U-Elbows, Tee, Drain cock, Union sink, Baths, Basin, Closet, and Bidets. Their uses
By the end of the lesson, students should be able to:
Differentiate pipeline fillings and sanitary appliances
Highlight their uses
Install/change pipeline fittings and sanitary appliances
WEEK 12
FAULT DETECTION
Procedure
Tools and their uses
Simple Maintenance
By the end of the lesson, students should be able to:
Define fault detection
Highlights the tools used for detection
Demonstrate the uses of the required tools
Carry out simple fault detection of equipment. Students in pairs:
Discuss the procedure for fault detection
Students in groups carry out fault detection of equipment
WEEK 2: SCALES AND SCALE DRAWING
Topic Outline:
- Definition and types of scale
- Simple scale drawing
Learning Objectives:
By the end of the lesson, students should be able to:
- Explain the meaning of scale in relation to drawing.
- Highlight the types of scale.
- Differentiate between various types of scales.
- Draw objects to given scales (Enlargement and Reduction).
Instructional Materials:
- Rulers, pencils, erasers
- Graph sheets
- Examples of scaled maps and drawings
- Drawing instruments (set squares, compasses, etc.)
Lesson Development:
- Meaning of Scale
A scale is the ratio of the size of a drawing or model to the actual size of the object it represents.
It helps in representing large objects like buildings, bridges, and machines on paper in manageable sizes.
Example:
If a wall is 10 meters long and it is drawn as 10 cm on paper, the scale is 1 cm : 1 m or 1:100.
- Types of Scales
There are three major types of scales used in technical drawing:
- Full Scale:
When the drawing is made to the same size as the actual object.
Example: 1:1 - Reduced Scale:
When the drawing is made smaller than the actual object.
Example: 1:10, 1:100 - Enlarged Scale:
When the drawing is made larger than the actual object (often used for small components).
Example: 2:1, 5:1 - Simple Scale Drawing
A simple scale drawing uses a linear measurement to represent actual dimensions.
Steps to draw using a scale:
- Determine the actual size of the object.
- Choose a suitable scale (e.g., 1:50).
- Divide the actual measurement by the scale ratio.
- Draw the object according to the new scaled measurement.
Example:
If a table is 200 cm long and the scale is 1:50,
So the table should be drawn 4 cm long on paper.
Class Activities:
- Students draw a simple rectangular box using a 1:2 scale (enlarged).
- Draw a classroom plan using a 1:100 scale (reduced).
Evaluation Questions:
- Define scale in relation to drawing.
- List and explain three types of scale.
- What is the scale ratio if 5 cm represents 10 m?
- Differentiate between enlargement and reduction.
- A road 2000 m long is represented by 20 cm on a map. Find the scale used.
Assignment:
Draw a simple floor plan of your classroom using a scale of 1:50. Label key parts like doors and windows.
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FIRST TERM JSS 2 BASIC TECHNOLOGY | SCHEMES OF WORK | WEEK 1
