The document discusses technical drawing lines and their uses: - It describes different types of lines used in technical drawings including thin continuous lines, thick continuous lines, short dashed lines, and long chain lines. - Each line type has a specific use, such as thin lines for construction lines and projections, thick lines for outlining objects, and dashed lines for hidden details or bends. - Center lines and projection lines are also discussed. - Examples of drawings with various line types are provided to illustrate front, side, and top views of objects with dimensions.

2.  Drawings of the full details of an
object (views and measurements)
 Shows different views of an object
namely; Front Elevation, Plan (top)
and End Elevation (side).
 Representing a 3D object in 2D.
 A form of parallel projection
 Drawn either in 1st angle or 3rd angle
http://www.wisc-online.com/Objects/ViewObject.aspx?ID=ENG19204

3. Lines
Types of Line Use
construction line, projection
thin continuous line, extension line
thick continuous outline
short dashes hidden detail line, bend line
long chain centre line

4. Lines
Centre line
Outline
Hidden
Lines
Projection
Lines

5. Eg 1
P
25
25
30
15
55
25
EE

7. Ex 1
P
20 40
10
20
10
FE EE
1 square represent 5 units.

8. Ex 2
P
20
80
20
40
FE
EE
1 square represent 5 units.

9. More Exercises