A textbook on mechanical and electrical engineering (1902)
International Correspondence Schools · Scranton : International Textbook Co. · leaf 432
s curved outline wasdivided by points into a number of equal parts. Thesepoints in the plan were then projected to the elevation andthere considered as assumed edges; in other words, thecvlinder was treated as a many-sided polygonal solid, this §16 DEVELOPMENT OF SURFACES 37 solid appearing… … (bj
