A textbook on mechanical and electrical engineering (1902)
International Correspondence Schools · Scranton : International Textbook Co. · leaf 395
Fig. 9 Fig. 10 represented by the heavily shaded band in Fig. 10, thesurfaces may be portions of the surfaces of different cones orof cones differing in size. The bases of this article areelliptical in outline. The ellipses are drawn by circular § IG DEVELOPMENT OF SURFACES 13 arcs. The vertexes of…
