# Oblique Drawing

Subject : Basic Technology

Class : Basic 9 / JSS 3

Term : 1st Term / First Term

Week: 8

Topic:

Oblique Drawing

Previous Knowledge : The pupils have been taught

Isometric Drawing

during their previous lesson or class

Behavioural Objectives : By the end of the lesson, learners will be able to

• define oblique drawing
• say the steps that are involved in oblique drawing

Contents:

• Definition
• Oblique drawing

This is also a pictorial method of drawing, in oblique projection, the object is drawn with one of its faces true to dimensions i.e. a face is parallel to its horizontal plane. The receding lines (oblique lines) may be drawn at angle 30o, 45o, or 60o, but 45o is mostly used. One disadvantage of oblique drawing is that it distorts the drawing and can never look natural. Therefore in order to prevent this distortion, the receding axes (widths) are usually drawn half-size.

Cabinet oblique drawing

Method of Oblique Projection

Cavalier  oblique  projection: In this projection the receding axes (width) are drawn half-size to reduce distortion, but they are dimension-ed full size. This was used to draw furniture i.e. cabinets.

Cabinet oblique projection

Presentation :

The Topic is presented step by step for easy assimilation by the learners.

Step 1 : The teacher revises the previous topics that had been taught during the precious lessons

Step 2 : The subject teacher introduces the new topic of the learners

Step 3 : He or she allows the students to give their own contributions and he corrects them when the needs arise

Evaluation

Briefly define the following terms :

• What do you understand by Oblique drawing