Sawing-in Machine.
I think nothing looks worse than a book with great holes in the back, sometimes to be seen when the book is opened, which are due to the inattention of the workmen. Besides, it causes great inconvenience to the forwarder if the cords are loose, and the only thing he can do in such a case is to cram a lot of glue into the grooves to keep the cord in its place. If, on the other hand, the saw cuts are |23| not deep enough, the cord will stand out from the back, and be distinctly seen when the book is finished, if not remedied by extra strips of leather or paper between the bands when lining up. It is better to use double thin cord instead of one thick one for large books, because the two cords will lie and imbed themselves in the back, whereas one large one will not, unless very deep and wide saw cuts be made. Large folios should be sawn on six or seven bands, but five for an 8vo. is the right number, from which all other sizes can be regulated.
Saw benches have been introduced by various firms. They can be driven either by steam or foot. It will be seen that the saws are circular, and can be shifted on the spindle to suit the various sized books. As the books themselves are slid along the table on the saws, the advantage is very great in a large shop where much work of one size is done at a time.
CHAPTER V. SEWING.
Flexible Work.—The “sewing press” consists of a bed, two screws, and a beam or cross bar, round which are fastened five or more cords, called lay cords. Five pieces of cord cut from the ball, in length, about four times the thickness of the book, are fastened to the lay cords by slip knots; the other ends being fastened to small pieces of metal called keys, by twisting the ends round twice and then a half hitch. The keys are then passed through the slot in the bed of the “press,” and the beam screwed up rather tightly; but loose enough to allow the lay cords to move freely |24| backwards or forwards. Having the book on the bed of the press with the back towards the sewer, a few sheets (better than only one) are laid against the cords, and they are arranged exactly to the marks made on the back of the sections. When quite true and perpendicular, they should be made tight by screwing the beam up. It will be better if the cords are a little to the right of the press, so that the sewer may get her or his left arm to rest better on the press.
Sewing Press.
If when the press is tightened one of the cords is loose, as will sometimes happen, a pencil, folding-stick or other object slipped under the lay cord on the top of the beam will tighten the band sufficiently. The foreign sewing presses have screws with a hook at the end to hold the bands, the screws running in a slot in the beam: in practice they are very convenient.
