Center Lines. Figure 80 shows a piece of panel work with breaks, as it is too large to be drawn to the full scale. As both sides of the center line are alike, there is no need of drawing more than one half of it; thus the figure indicates the common method of showing an entire view by drawing one half of it. Notice that the horizontal dimensions are for the entire width, as though the full drawing were shown; therefore but one arrow point is necessary. The center line is often used as indicated in the front and sectional view of the music cabinet, Fig. 81, one half of the outside and the vertical section being shown.

Fig 80. - Use of a Center Line.

Fig. 81. - Use of a Center Line to Show Outside View and Section.