Higbee, F. G · New York, John Wiley & Sons · leaf 169
, and Fig. 124 shows a stringmodelof a right conoid. Where both directrices become curved Hues the surfacebecomes a cylindroid.Fig. 122 shows such asurface and illustratesthe skewed arch, one ofthe useful applicationsof the surface. Thecylindroid is also madeuse of in buildings forconnecting arched… … Fig. 124. — A string model of a right conoid.The base of this surface is a, circle which is alsothe curved directrix; the bar at the top is thestraight Une directrix. The plane director isparallel to the ends of the box. Given the directrices and the planedirector to draw the plan and elevation of…
Geometry, Descriptive
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