Textbook of Engineering Drawing, Second Edition

4.40 Textbook of Enginnering Drawing------------------

7'C====:2~~~~=--------.

T

Q V

I

~\ =,

~L

Fig. 4.57 Rectangle Method

AD. These two lines intersect at point PI as shown in Fig. 4.58.

4. Similarly obtain other points P 2'P 3' etc.


5. Draw a smooth curve passing through these points to obtain the required parabola.
   Problem: Construct a parabola within a parallelogram of sides 120mm X 60 mm. One of the
   included angle between the sides is 75°.
   Solution : (Fig.4.59)


6. Construct the parallelogram PQRS (PS = 120 mm PQ = 60 mm and angle QPS = 75°).
   Bisect PS at 0 and draw VO parallel to PQ.

~~-~-~-~H-----------~~ 1000

Fig. 4.58