Fig. 2.
Besides the traditional sizes, paper is now made of almost any length and width, resulting in books of odd shape, and the names folio, quarto, &c., are rather losing their true meaning, and are often used loosely to signify pages of certain sizes, irrespective of the number that go to a sheet.
On receipt, for instance, of an octavo book for folding, the pile of sheets is laid flat on the table, and collated by the letter or signature of each sheet. The first sheet of the book proper will probably be signature B, as signature A usually consists of the half-title, title, introduction, &c., and often has to be folded up rather differently.
The “outer” sides, known by the signature letters B, C, D, &c., should be downwards, and the inner sides facing upwards with the second signatures, if there are any, B2, C2, D2, &c., at the right-hand bottom corner.
The pages of an octave book, commencing at page 1, are shown at [fig. 3]. A folder is taken in the right hand, and held at the bottom of the sheet at about the centre, and the sheet taken by the left hand at the top right-hand corner and bent over until pages 3 and 6 come exactly over pages 2 and 7; and when it is seen that the headlines and figures exactly match, the paper, while being held in that position, is creased down the centre with the folder, and the fold cut up a little more than half-way. Pages 4, 13, 5, 12 will now be uppermost; pages 12 and 5 are now folded over to exactly match pages 13 and 4, and the fold creased and cut up a little more than half-way, as before. Pages 8 and 9 will now be uppermost, and will merely require folding together to make the pages of the section follow in their proper order. If the folding has been done carefully, and the “register” of the printing is good, the headlines should be exactly even throughout.
Fig. 3.
The object of cutting past the centre at each fold is to avoid the unsightly creasing that results from folding two or more thicknesses of paper when joined at the top edge.