A textbook on mechanical and electrical engineering (1902)
International Correspondence Schools · Scranton : International Textbook Co. · leaf 432
(bj … The removal from the cone at {(7) of the pieces marked xleaves a solid that may be recognized as a quadrangularpyramid—better shown at (d), the pieces being removedand shown in an adjacent position. The illustration at (c) 38 DEVELOPMENT OF SURFACES 16 is a perspective elevation of the parts shown…
