Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 223
e), the planes of projection are not so opened as to lieadjacent to the same axis line, but they are placed at will,perhaps on different drawing boards. However, the fundamentalrelations between the reference planes are maintained. TheV planes passed through the plan axis and the datum planefor… … A % 4 Fig. 187 shown is such as to involve reentrant angles or when the objectis hollow and it is necessary to show the thickness of the shellor the interior arrangement, a different kind of drawing, calleda section, is required. The necessity for making a section lies in the fact that inordinary…
Geometry, Descriptive
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