JSS3 First Term Basic Technology Lesson Note – Isometric Drawing

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 FIRST TERM E-LEARNING NOTE                                CLASS: JS3 (BASIC 9)

SUBJECT: BASIC TECHNOLOGY

WEEK ONE: REVISION OF PREVIOUS TERM WORK (JS 2)

WEEK:  TWO

TOPIC: Isometric Drawing:

(a) Examples of isometric Drawings, Isometric drawing of simple shaped blocks without curves. (b) Examples of Oblique Drawings,

SUB-TOPIC:

• ISOMETRIC DRAWING
• OBLIQUE DRAWING

The method of drawing solid objects which shows the three dimensions length, width and depth in one view is called pictorial drawing. The pictorial drawing can be divided into three groups:

• The isometric drawing
• The oblique drawing
• The perspective drawing

DEFINITION OF ISOMETRIC DRAWING

The isometric drawing is the pictorial method of drawing an object in which all the isometric axes are projected to an angle 30⁰ to the horizontal. The isometric drawing shows three axes of an object i.e.

• The length
• The width
• The height

The isometric axes are inclined at an angle 120⁰ to one another. There are (3) three isometric axis one of them is vertical, the other two receding axes are appositely inclined at an angle of 30⁰ to the horizontal. The angle between any two isometric axes is 120⁰

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