Understanding Line Types 47
Cutting-Plane and Viewing-Plane Lines.
These are very prominent broken lines (usually two dots and a dash) that are used to show the location
of cutting planes for sectional views. Arrows on their ends indicate the direction in which the section is
observed (Figure 3.9A). Lines or circular symbols are sometimes used at their ends to relate the cutting
planes to their section views. Like property lines, these lines are normally heavier than any other lines
on a drawing.
Figure 3.7 A. Dimensions terminated with dots. B. Example of a chain-dimensions line.