Oblique Drawing JSS3 Basic Technology Lesson Note

TOPIC: OBLIQUE DRAWING 

CONTENT

1.         Meaning of oblique drawing
2.         Methods of drawing oblique drawing
3.         Meaning of perspective drawing 
4.         Classes of perspective drawing

OBLIQUE DRAWING:  This is a method of drawing the shape of a solid object in which the projection angles are drawn at an angle of 45 degrees to the horizontal plane. It recognizes objects in three (3) dimensions i.e. length, breadth, and depth.

ACTIVITY: Produce an oblique drawing of an isometric drawing of a rectangular block with the given dimension length of 50mm, width of 30mm, and height of 70mm.

METHODS OF DRAWING OBLIQUE

1.         CAVALIER METHOD: when the receding axis of an angle 450 is drawn in full length
2.         CABINET OBLIQUE:  this is when the receding axis of an angle 450 is half the length.

EVALUATION

1.         Define oblique drawing.
2.         Differentiate between the cavalier type of oblique drawing and cabinet oblique drawing.