| 摘要 |
<p>A booklet suitable for use as a workbook or as a supplement to other printed publications is made from a single continuous web of paper, printed on both sides thereof, which has been folded in alternately opposite directions along successive perforated lines extending transversely of the web at constant longitudinal spacings. The folded web is stapled or otherwise held together along a binding edge. The thus produced booklet has every two neighbouring leaves thereof joined together at their unbound edges opposite the binding edge. Such joined leaves are to be separated by the reader by tearing along the row of perforations between their unbound edges. The top and bottom edges of every two neighbouring leaves, extending between the binding and unbound edges, may further be pasted together in a readily openable manner. In the use of this booklet as a workbook, for example, questions and answers may be printed on the outer and inner pages, respectively, of every two joined leaves.</p> |
