Page:The Art of Bookbinding, Zaehnsdorf, 1890.djvu/53

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SEWING.

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