Method Of Showing Parts Obscured From Sight. The outline of details, which in any view of an object are hidden, is frequently shown by dotted lines. Thus, in Fig. 12, the general outline of the plan and elevation shows a rectangular block; if the circle in the plan is associated with the dotted lines in the elevation, it is not difficult to imagine a round hole extending through the center of the block. If the hole penetrates to only half the depth of the block, dotted lines will be placed as shown by Fig. 13; if the hole is larger at the top than at the bottom, the drawing will appear as shown by Fig. 14; if smaller at the top, as shown by Fig. 15. In Fig. 16 dotted lines indicate the diameter of a bolt holding the two pieces A and B together.

Fig. 8

Fig. 9

Fig. 10

Fig.11

Fig. 12

Fig. 13

Fig. 14:

Fig. 15