Publisher's Synopsis
Excerpt from A Catalogue of a Collection of Models of Ruled Surfaces: With an Appendix, Containing an Account of the Application of Analysis to Their Investigation and Classification
A skew quadrilateral, with all its sides equal, and pierced holes at equal distances.
As far as the curved surface is concerned, the same as No. 5. But the hinges are altered in direction, and the model shows plans and elevations of the right line generators of the surface. The rings also show parabolic sections of the surface.
In consequence of the alteration in the direction of the hinges, the spacing of the inclined bars, although equidistant, is at a different pitch from that of the horizontal bars.
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