Next, the mill-boards are applied, cut so as to project about an eighth to a quarter of an inch from the edges of the book on three sides. The book is held to the boards by the ends of its cords being interlaced, i. e.: passed twice through holes pierced in the boards, the loose ends of the cords being then wet with paste and hammered down flat to the surface of the boards. The best tar-boards should be used, which are made of old rope; no board made of straw is fit to be used on any book. Straw boards are an abomination—a cheap expedient which costs dearly in the end. The binder should use heavy boards on the larger and thicker volumes, but thin ones on all duodecimos and smaller sizes.
Next, the books are subjected to a second pressing, after which the lining of the back is in order. Good thick brown paper is generally used for this, cut to the length of the book, and is firmly glued to the back, and rubbed down closely with a bone folder. A cloth "joint," or piece of linen (termed "muslin super,") is often glued to the back, with two narrow flaps to be pasted to the boards, on each side, thus giving greater tenacity to the covering. If the book is to be backed so as to open freely, that is, to have a spring back or elastic back, two thicknesses of a firm, strong paper, or thin card-board are used, one thickness of the paper being glued to the back of the book, while the other—open in the middle, but fastened at the edges, is to be glued to the leather of which the back is to be made.
After this, comes putting the book in leather. If full bound a piece of leather cut full size of the volume, with about half an inch over, is firmly glued or pasted to the boards and the back, the leather being turned over the edges of the boards, and nicely glued on their inside margin. It is of great importance that the edges of the leather should be smoothly pared down with a sharp knife, so as to present an even edge where the leather joins the boards, not a protuberance—which makes an ugly and clumsy piece of work, instead of a neat one.
For half-binding, a piece of leather is taken large enough to cover the back lengthwise, and turn in at the head and tail, while the width should be such as to allow from one to one and a half inches of the leather to be firmly glued to the boards next the back. The four corners of the boards are next to be leathered, the edges of the leather being carefully pared down, to give a smooth surface, even with the boards, when turned in. The leather is usually wet, preparatory to being manipulated thus, which renders it more flexible and ductile than in its dry state. The cloth or marbled paper is afterwards pasted or glued to the sides of the book, and turned neatly over the edge of the boards.
It may be added, that the edges of the boards, in binding nice books, are sometimes ground off on a swiftly revolving emery-wheel, giving the book a beveled edge, which is regarded as handsomer and more finished than a straight rectangular edge.
All the processes hitherto described are called "forwarding" the book: we now come to what is denominated "finishing." This includes the lettering of the title, and the embellishing of the back and sides, with or without gilding, as the case may be. Before this is taken in hand, the leather of the book must be perfectly dry. For the lettering, copper-faced types are used to set up the desired sequence of letters and words, and care and taste should be exercised to have (1) Types neither too large, which present a clumsy appearance, nor too small, which are difficult to read. (2) Proper spacing of the words and lines, and "balancing" the component parts of the lettering on the back, so as to present a neat and harmonious effect to the eye. A word should never be divided or hyphenated in lettering, when it can be avoided. In the case of quite thin volumes, the title may be lettered lengthwise along the back, in plain, legible type, instead of in very small letters across the back, which are often illegible. The method of applying gold lettering is as follows: the back of the book where the title is to go, is first moistened with a sticky substance, as albumen or glaire, heretofore mentioned, laid on with a camel's hair brush. The type (or the die as the case may be) is heated in a binder's charcoal furnace, or gas stove, to insure the adhesion of the gold leaf. The thin gold leaf (which comes packed in little square "books," one sheet between every two leaves) is then cut the proper size by the broad thin knife of the "finisher," and carefully laid over the sized spot to receive the lettering. Usually, two thicknesses of gold leaf are laid one above another, which ensures a brighter and more decided effect in the lettering. The type metal or die is then pressed firmly and evenly down upon the gold-leaf, and the surplus shavings of the gold carefully brushed off and husbanded, for this leaf is worth money. The gold leaf generally in use costs about $6.50 for 500 little squares or sheets. It is almost inconceivably thin, the thickness of one gold leaf being estimated at about 1/280000 of an inch.
Besides the lettering, many books receive gold ornamentation on the back or side of a more or less elaborate character. Designs of great artistic beauty, and in countless variety, have been devised for book ornaments, and French and English book-binders have vied with each other for generations in the production of decorative borders, fillets, centre-pieces, rolls, and the most exquisite gold-tooling, of which the art is capable.
These varied patterns of book ornamentation are cut in brass or steel, and applied by the embossing press with a rapidity far exceeding that of the hand-work formerly executed by the gilders of books. But for choice books and select jobs, only the hands are employed, with such fillets, stamps, pallets, rolls, and polishing irons as may aid in the nice execution of the work. If a book is to be bound in what is called "morocco antique," it is to be "blind-tooled," i. e.: the hot iron wheels which impress the fillets or rolls, are to be worked in blank, or without gold-leaf ornamentation. This is a rich and tasteful binding, especially with carefully beveled boards, and gilded edges.
On some books, money has been lavished on the binding to an amount exceeding by many fold the cost of the book itself. Elegant book-binding has come to be reckoned as a fine art, and why should not "the art preservative of all other arts"—printing—be preserved in permanent and sumptuous, if not splendid style, in its environment? Specimens of French artistic binding from the library of Grolier, that celebrated and munificent patron of art, who died in 1565, have passed through the hands of many eager connoisseurs, always at advancing prices. The Grolier binding was notable for the elegant finish of its interlaced ornaments in gold-leaf, a delicacy of touch, and an inimitable flowing grace, which modern binders have struggled after in vain. At the Beckford Library sale in London, in 1884, there was a great array of fine French bindings of early date. A book from Grolier's library, the "Toison d'Or," 1563, brought £405, or over $2,000, and a Heptameron, which had belonged to Louis XIV, in beautiful brown morocco, with crown, fleur-de-lys, a stag, a cock, and stars, as ornaments, all exquisitely worked in gold, lined with vellum, was sold for £400. Following the Grolier patterns, came another highly decorative style, by the French binders, which was notable for the very delicate gold tooling, covering the whole sides of the book with exquisite scroll-work, and branches of laurel.
The most celebrated of English book-binders was Roger Payne, who was notable for the careful labor bestowed on the forwarding and finishing of his books, specimens of which are still reckoned among the chefs-d'oeuvre of the art. His favorite style was a roughly-grained red morocco, always full-bound, and he kept in view what many binders forget, that the leather is the main thing in a finely executed binding, not to be overlaid by too much gilding and decoration. He charged twelve guineas each (over $60) for binding some small volumes in his best style. Payne's most notable successors have been Lewis, Hayday, Bedford, and Zaehnsdorf, the latter of whom is the author of a treatise on book-binding. At the art exhibition of 1862, a book bound by Bedford was exhibited, which took two months merely to finish, and the binding cost forty guineas; and a Doré's Dante, exquisitely bound by Zaehnsdorf, in Grolier style, cost one hundred guineas.