I posted some of these these pages from old drafting standards on a Throwback Thursday two weeks ago, and people loved them, so I will share more of the timeless words of wisdom from the Drafting Time Machine. This is from a Drafting Standards Manual from Ralph M. Parsons Company in 1975 and were titled the Basic Dozen.
Enjoy this Basic Dozen Tip on drafting from 1975:
Point 5 Use Dotted Lines to Clarify
Although the illustrations and terminology may be out of date the wisdom is still true to this day.