Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 203
y projecting its outline,as in the circular stairs shown in Fig. 178. In most cases,however, a better conception is given if some of the elements 186 DESCRIPTIVE GEOMETRY [VIII, § 162 of the surface are drawn. When this is done, as in Fig. 176,the drawing shows the modehng of the surface to a… … of revolution (§ 161), is generated by revolving a straight lineabout an axis not in its own plane. As in the case of every surface of revolution, any sectionperpendicular to the axis will be a circle. That point of thegeneratrix which is nearest the axis will generate the smallestpossible circular…
Geometry, Descriptive
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