168 Section 2 Drafting Techniques and Skills
Divide a Line Into a
Given Number
of Equal Parts
1. Line AB is given and is to be divided into
11 equal parts, Figure 6-8A.
2. With a T-square and triangle, draw a
vertical line at Point B.
3. Locate the scale with one point at Point A
and adjust so that 11 equal divisions are
between Point A and the vertical line
(Line BC).
4. Mark vertical points at each of the 11
divisions. Project a vertical line parallel
to Line BC from each of these divisions
to Line AB. These verticals divide Line AB
into 11 equal parts.
Using the Inclined Line Method
1. Line DE is given and is to be divided into
six equal parts, Figure 6-8B.
2. Draw a line from Point D at any con-
venient angle. With a scale or dividers,
lay off six equal divisions. The length of
these divisions is chosen arbitrarily, but
all should be equal.
3. Draw a line between the last division,
Point F, and Point E.
4. With lines parallel to Line FE, project the
divisions to Line DE. This will divide
Line DE into six equal parts.
Figure 6-8. Methods used for dividing a line. A—The
vertical line method. B—The inclined line method.
A
B
C
D
E
F
A B
Divide a Line Into
Proportional Parts
Using the Vertical Line
Method
1. Line AB is given and is to be divided into
proportional parts of 1, 3, and 5 “units.”
See Figure 6-9.
2. With a T-square and triangle, draw a
vertical line at Point B.
3. Locate the scale with one point on Point A.
Adjust so that nine equal units (1 + 3 + 5 = 9
units) are between Point A and the verti-
cal line (Line BC).
4. Mark each of the proportions. Project
a vertical line from these divisions to
Line AB. These verticals divide
Line AB into proportional parts of
1, 3, and 5 units.
Figure 6-9. A line can be divided into proportional
parts by using the vertical line method.
A
1 3 5
Proportional parts
(1)
(3)
(5)
Units
B
C