A textbook on mechanical and electrical engineering (1902)
International Correspondence Schools · Scranton : International Textbook Co. · leaf 391
Fig. 4 applied to the pyramid, it is found that the lines indicatedon the paper converge to a point, as shown in Fig. 4 {a)and {b). It is noticed, also, that this point o. Fig. 4, definesthe position of the vertex of the pyramid. The same may besaid of the cone, illustrated in Fig. 5 (<^) and… … Fig. 5 are first indicated on the surface of the cone correspondingto its elements, it will be found, when the covering isunrolled, that these lines also converge to a point, as in thecase of the edges of the pyramid. § 16 DEVELOPMENT OF SURFACES 9 It was found possible to institute a system of…
