Fig. 226.
Fig. 227.
Fig. 228.
For the clearness of the drawing, it is desirable to have all corners, edges and outlines appear in such solid lines as they appear to the eye. If, therefore, certain sharply defined outlines occur on one side more than on the opposite one, it is most desirable to take the view against the side that has the most definitely marked outlines.
If the opposite side should show a number of wholly different features, it may prove even desirable to show this side also, thus gaining four views instead of the usual three, and so obtain a more complete understanding of the shape of the object, besides giving increased facilities for dimensioning each part of the body.
This additional view may be taken from the sides, as well as up or down, thus making a maximum of five views possible by which the outside of the object may be delineated.
[Fig. 230] shows why it may be desirable to take five views of a block that has a receding space of different outlines in each of the side and top and bottom faces.
It is not necessary, however, to resort to five views in such a case as is represented in [fig. 230], as the only differing feature, the circular space in III bottom, might be shown in III top by dotted lines, and the difference of II right might be shown in II left, also by dotted lines. It is desirable to show four or five views only where great complication and consequent lack of clearness through numerous dotted lines would result from having a less number of views.