Bookbinding and its auxiliary branches . brought over to the right and left by lightly tapping theback with a hammer from the center to the sides. Do nothit hard on the kettle-stitch nor flat on the back, as thethread may break and dents appear; always tap at aslant to the sides to form the ridge. The ridge thusformed should be at an angle, so that in setting the boardclose to it in the subsequent operation, all parts will beeven. When opening the book, the signatures should befree from wrinkles, as their presence indicates poor work-manship. Flexible or limp-bound books need not bebacked; sti
Bookbinding and its auxiliary branches . brought over to the right and left by lightly tapping theback with a hammer from the center to the sides. Do nothit hard on the kettle-stitch nor flat on the back, as thethread may break and dents appear; always tap at aslant to the sides to form the ridge. The ridge thusformed should be at an angle, so that in setting the boardclose to it in the subsequent operation, all parts will beeven. When opening the book, the signatures should befree from wrinkles, as their presence indicates poor work-manship. Flexible or limp-bound books need not bebacked; still some binders prefer to back all letterpress 104 BOOKBINDING books, claiming that it facilitates the opening. If suchbooks are backed, the ridge should be very small, as other-wise it would be bulky. The combination backing machine and press is a mostuseful article in any bindery, as it is easily convertible. Seybold Convertible Job Backer and Press. from its horizontal position as a job backer to a verticalposition as a small standing press. The jaws are twenty-four inches wide, and the construction is rigid and com-pact. Backing Machine.—A more expeditiousbacking method is that done with a roller backer. Thejaws of the machine are adjusted to the thickness of thebook by the hand wheel on top, back of the roller. Theroller is adjusted by a hand wheel on the right of the ROUNDING AND BACKING 105 machine; it is raised or lowered by two nuts, operatingon screws on both sides. These are raised or lowered,according to the height of the book. Accurate roundingis indispensable when backing with this machine. Whenadjusted, put the book in the machine as described in thepreceding chapter, and clamp tight by stepping on thefirst treadle; then step on the second treadle, and bring
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbookbinding, bookyear
