In Fig. 23 the section is sketched in
perspective, to show more clearly what it means. Another section is made
lengthwise of the building (Fig. 20). It is customary to indicate on
the plan by dotted lines the portion through which the section is
supposed to be made. Thus on the plans the lines A B and C D are drawn,
and the corresponding sections are labeled with the same lines. As with
the elevation, one section must be compared with another to get the full
information from them. Thus in Fig. 18, the ceiling, M, is shown as a
semicircle; in Fig. 20, it is only a space between the top and bottom
lines. It is, certainly, shaded here to give the effect of rotundity,
but that is quite a superfluity. On Fig. 18 the height of the side
windows is shown at F, and the thickness of the wall in which they are
made. In Fig. 20 (F) their width and spacing are shown. In Fig. 18 some
lines drawn across, one over the other, are shown at H. These are the
stairs, of which in this section we see only the fronts, or risers, so
that they appear merely as lines (showing the edge of each step) drawn
one over the other. At H on the plan, Fig. 21, we again see them
represented as a series of lines, but here we are looking down on the
top of them, and see only the upper surfaces, or "treads," the edges
again appearing as a series of lines.
Pages:
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75