A textbook on mechanical and electrical engineering (1902)
International Correspondence Schools · Scranton : International Textbook Co. · leaf 390
Fig. 3 with paper, a number of lines being ruled on the coveringparallel to its axis, as shown at c d^ ef, etc. The paper isshown unrolled in Fig. 8 {b), and it will be observed thatnot only the outer edges a b and a b are parallel to eachother, but that all other lines parallel to the axis of…
