Categories: Lesson Notes

JSS3 Basic Technology Lesson Note on Scale and Its Uses

The website has the complete lesson note for all the subjects in secondary school but this piece showcases the JSS3 Basic Technology Lesson Note on Scale and Its Uses. You can use the website search button to filter out the subject of interest to you.

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SUB-TOPIC FOUR

(a) Scale and its uses

(b) Construction of scale: (i) Plain scale (ii) diagonal scale.

SCALE AND ITS USES

Scales are used for enlargement and reduction. A scale is used when an object is too large or too small to be recognized on paper.

Scales are represented in various ways such as:

  • Percentages: 50%, 25%, 20%, 10%, 2%, 1% etc.
  • Ratio: 1:2, 1:10, 1:100, 1:1000, 4:1, 3:1, 2:1 etc.
  • Description: Full size, Half size, twice full size, etc.
  • Representative fraction: ½, 1/10, 1/100, 1/1000 etc.

This representative fraction implies:

There are two types of Scales:

  • The plain scale and
  • The diagonal scale

EVALUATION:

  • What is scale used for?
  • Mention two types of scale
  • How are scales represented?

Sub-Topic 2: Construction of scale

Construction of plain scale

Activity 1:        To construct a plain scale of 1:40mm to read up to 4meters

Procedure:

  • Construct a rectangle whose length is 40mm * 4mm = 160mm.
  • Divide the rectangle into 4 equal parts.
  • Use the numbering as shown.
  • Divide OA into 10 equal parts.
  • This is a plain scale.

Activity 1:  To construct a plain scale of 1:50mm to read up to 3meters and to indicate the distance 2.6m.

Procedure:

  • Construct a rectangle whose length is 50mm * 3mm = 160mm.
  • Divide the rectangle into 3 equal parts.
  • Number the division as shown.
  • Divide OA into 10 equal parts.
  • Indicate the given distance 2.6m as shown.

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