1. Lines and Symbols F A5
Unit 4

2. Unit 4 Lines & Symbols Learning Objectives
page 37
Learning Objectives
Identify features from different lines
Match drawings symbols with their meaning

3. Alphabet of Lines property line border line object line hidden line
UNIT 4
page 37
property line
border line
object line
hidden line
center line

4. Alphabet of Lines
UNIT 4
page 38
dimension &
extension lines
23’-6”

5. Alphabet of Lines
UNIT 4
page 38
break lines
long
short

6. section identification
Alphabet of Lines
UNIT 4
page 38
cutting-plane lines
direction section
is facing
section identification F A5
sheet number
location of section B G
S12

7. Lines
Figure 4-1

8. Symbols
Figure 4-2

9. Symbols
Page 253

10. Symbols
Page 253

11. Test Your Knowledge
UNIT 4
Take 5 minutes & answer questions on bottom of page 40

12. Line Activity Take 5 minutes & draw lines in Activity 4-1 on page 41
UNIT 4
Take 5 minutes & draw lines in Activity 4-1 on page 41

13. Construction Drawing Symbol
UNIT 4
Take 10 minutes & draw the proper symbol for Activity 4-2 on page 42
Refer to Section 7 for library of symbols
starting on page 253
END UNIT 4