Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 258
Fig. 223 XI, §2011 APPLICATIONS OF CHAPTERS VII-VIII 241 of the opening must be the same inside and out, both at thecrown and at the springing line. Four methods of generation are shown and others are pos-sible, of course. In order to assist in a clear conception of thedifference between the… … Fig. 224 the crowns of the two curves were at different levels, but theother cases are possible for any combination of arches. It is not at all unusual to run one warped surface into another,the two having one common element but quite different direc-trices. One such case is shown in the covering…
Geometry, Descriptive
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