Part 3

In 1804, before the introduction of stereotyping into this country, Mathew Carey, the well-known enterprising publisher in Philadelphia, had the Bible in quarto set up entire, and regularly imposed in chases, to print from at convenience, according to the demand for the volume. The type was cast by Binny & Ronaldson. Stereotyping would have saved much of the large outlay required to carry out the scheme, which, nevertheless, even under these circumstances, was doubtless highly remunerative. The weight of type must have amounted to 25,000 pounds, to say nothing of the number of chases and column-rules required.

ELECTROTYPING.

Stereotyping has been superseded by the process of electrotyping, as described below.

The pages, after being delicately polished with plumbago, are laid in a press; a pan of prepared wax, warmed, is placed over them and pressed down into the counter of the types. The wax mould is then dusted with plumbago, and suspended in the electric bath. On this, in a few hours, is deposited a thin shell of copper, which, after being coated with tin solder, is backed up with metal to the usual thickness of a stereotype plate.

The same care in preparing the pages for electrotyping must be observed as for stereotyping. For stereotyping, high slugs are placed only at the top and foot of the page; but, for electrotyping, they must be set around on all sides, and the bevelled flange must be afterward made by side-planing.

LITHOGRAPHY.

This is the art of printing, by a chemical process, from designs made with a greasy material upon stone. It was discovered about the beginning of the present century by Alois Senefelder, an actor of Munich, Bavaria, whose patience and perseverance under the most disadvantageous circumstances were truly remarkable and praiseworthy. Differing from all other methods of printing, the impressions are obtained from a level surface.

The stone best calculated for lithographic purposes is a sort of calcareous slate found on the banks of the Danube, in Bavaria, the finest being found near Munich. A good stone is porous, yet brittle, of a pale yellowish drab, and sometimes of a gray neutral tint. The stones are formed into slabs from one and a-half to three inches in thickness. To prepare them for use, two stones are placed face to face with some fine sifted sand between them, and then are rubbed together with a circular motion, to produce the requisite granulation, which is made finer or coarser to suit the purpose of the artist.

The principal agents used for making designs on stone are called lithographic chalk and lithographic ink. They are composed of tallow, virgin wax, hard tallow soap, shellac, sometimes a little mastic or copal, and enough lampblack to impart a colour to the mass. These ingredients are put into an iron sauce-pan, and exposed to a strong fire till the mass is in a state of ignition. When the quantity is reduced one-half, the pan is carefully covered, or put into water to extinguish the flame and cool the mixture. After being well worked up, it is formed into small cakes or sticks. The ingredients are the same in the chalk and the ink, but the proportions are varied, and a little Venice turpentine is often added to the latter. The chalk is used in a dry state; but the ink is dissolved by rubbing in water, and is used in a pen or with a camel-hair pencil. The presence of soap renders it soluble in water.

The artist completes a drawing with the chalk upon a grained stone as he would make a drawing in pencil or chalk upon paper. If while in this state a wet sponge were passed over the face of the stone, the drawing would wash off. To prevent this, and to make it capable of yielding impressions, a weak solution of nitrous acid is poured over it, which unites with and neutralizes the alkali or soap contained in the chalk, and renders it insoluble in water. After this, the usual course is to float a solution of gum over the whole face of the stone; and, when this is taken off, the drawing is no longer removable by the application of a wet sponge, because the chalk is now insoluble. The stone is now ready for the printer, who obtains impressions by the following process.

Having damped the surface of the stone equally with a sponge filled with water which has been slightly tinctured by acid, the printer finds that the water has been imbibed by only those parts of the stone which are not occupied by the drawing, which, being greasy, repels the water and remains dry. A roller covered with ink is now passed over the stone, which will not even be soiled where it is wet, from the antipathy of oil to water. But the parts occupied by the drawing, being dry and greasy, have an affinity for the printing-ink, which, therefore, leaves the roller and attaches itself to the drawing. In this state it is said to be charged or rolled in. A sheet of damped paper is then put over it, and, the whole being passed through a press, the printing-ink is transferred from the stone to the paper, and the impression is obtained. Great nicety is requisite in the preparation of all the agents employed in this art, and in the process of printing as well as in making the drawing on the stone.

The most important application of this process is in the production of copies of coloured drawings and paintings,—a process known as _chromo-lithography_. The object here being to produce as nearly as possible fac-similes in colour, touch, and texture, as well as in drawing and light and shadow, of pictures from the pencils of painters of the highest standing, it has been found necessary to employ a large number of stones, in order to produce the almost infinite varieties of tints which are found united in a single picture,—every stone giving a separate impression in its own particular colour or tint. The mode of procedure is somewhat as follows. First, an outline of the entire subject is made by means of transfer paper, or otherwise, on a stone which is called the outline or keystone of the work. This stone yields impressions which are transferred as guides to all the other stones. On a second and third stone which serve as the basis of the print the general effect of the drawing is washed in, and from these are printed what may be called the chiaroscuro, in a faint tint of sepia and of a neutral colour or gray,—corresponding, in fact, very nearly to the neutral or dead colouring of a water-colour drawing in the method adopted by the early water-colour painters. The stones which follow are each charged with a particular colour or tint, and each leaves its impression on only a particular portion of the print,—one stone printing only the parts which are intended to be yellow or a modification of yellow, another red, another blue, and so on. Other stones charged in parts with grays or secondary colours serve to blend and harmonize the crude colours; others follow which modify these; and, finally, one gives the sharp dark touches, and is usually followed by another which supplies a sort of glaze or finishing wash, and subdues and harmonizes the whole. Of course, we have merely indicated the general method. It will be understood that the sequence of the colours in the printing, the special quality and strength to be given to each particular tint, the effect to be produced by their super-position, and many other particulars, have all to be taken into account in planning the arrangement of the colours on the stones;—since a sequence in some respects different, and an entirely different modification of colours, have to be employed for the works of most artists; and it happens that much of the colour on each of the earlier stones is covered by that of succeeding stones, and that thus only can the broken tints of the original be imitated. It is, in fact, only by watching the progress of a print through all its stages that any clear idea can be obtained of the beauty and accuracy of the whole process, of the prevision that must be exercised, and of the skill, care, and taste required at every step to carry it to a successful termination. For some of the more elaborate prints, from thirty to forty stones have been required to produce a finished print. And in order to produce this print, it must be borne in mind that each sheet of paper has to be passed as many times through the press as there are stones, since each stone imprints upon it only its own particular section of the work. Of course, in proportion to the increase in the number of the stones, does the difficulty increase of making the work upon each fall exactly upon its proper place in the general design; for, if any one were misplaced only the fiftieth of an inch, the drawing and colour of the whole would be disturbed. Hence it is found necessary to arrange the _register_, or adjustment of the stones, with the utmost care and precision, and to exercise the most careful supervision in the printing, since the sheet of paper expands considerably in passing through the press, and has to be dried and re-damped before it can be passed through again. But practically this is all accomplished with seeming ease, and a large and most complex subject will be found, when the last stage has been reached, to bear the most minute scrutiny; and the result, even when the copy is placed alongside the original, will surprise and delight equally those who have followed the work through its several steps and those who may only examine the completed work.

Of late, many chromos have been beautifully printed from prepared blocks on an ordinary cylinder-press.

ENGRAVING.

The invention of wood engraving has been claimed for the Chinese, whose books have certainly been printed from engraved wood blocks for ages. It is not, however, until the beginning of the fifteenth century that we find any evidence of the existence of wood engraving as we now understand it.

It is probable that Italy was the first European country to make engravings, but only for printing playing-cards. Holland and Germany soon applied the art to better ends.

The earliest print of which any certain information can be obtained is in the collection of Earl Spencer. It was discovered in one of the most ancient convents of Germany,—the Chartreuse of Buxheim, near Memmingen in Bavaria,—pasted within the cover of a Latin MS.; it represents Saint Christopher carrying the infant Saviour across the sea, and is dated 1423. We give a reduced fac-simile of this curious engraving. The inscription at the bottom has been thus translated:—

In whichever day thou seest the likeness of St. Christopher, In that same day thou wilt, at least from death, no evil blow incur.—1423.

Shortly afterward, a series of books printed entirely from wood engravings, called block-books, were issued. The most important of them were the _Apocalypsis, seu Historia Sancti Johannis_; the _Historia Virginis ex Cantico Canticorum_; and the _Biblia Pauperum_, the last containing representations of some of the principal passages of the Old and New Testaments, with explanatory texts. The illustrations seem to be drawn with a supreme contempt for perspective and proportion, but bear evidence of the draperies and hands and faces having been carefully studied. The above is a copy of one of the cuts in the _Apocalypsis_. It represents St. John preaching to three men and a woman, with the inscription: “_Conversi ab idolis, per predicationem beati Johannis, Drusiana et ceteri_,” (By the preaching of St. John, Drusiana and others are withdrawn from their idols.) The adjoining cut, from the _Biblia Pauperum_, is curious as showing the general manner of representing the creation of Eve during the fifteenth century. Both have the appearance of careful drawings “spoiled in the engraving.” Previous to the invention of movable types, whole books of text were also engraved on wood, and the impressions were evidently taken by rubbing on the back of the paper, instead of a steady pressure, as in the printing-press, the ink used being some kind of distemper colour.

The wood to be engraved on is carefully selected, and cut up into transverse slices seven-eighths of an inch thick. This is done by circular saws, which are necessarily very rigid, so as to insure good even cuts.

After being cut, the slices are placed in racks something like plate-racks, and thoroughly seasoned by slow degrees in gradually heated rooms. When sufficiently seasoned they are reduced to parallelograms of various sizes, the outer portion of the circular section near the bark being cut away, and all defective wood rejected; such, for instance, as knots, irregular grain, as that resulting from the position of branches, which are indicated by light-coloured markings in the wood, known in the trade as “comets,” from their resemblance in shape to those fiery bodies. They are softer than the surrounding wood, and consequently do not cut well with the graver; therefore much care and a practised eye are needed in selecting suitable wood. A section of boxwood almost always exhibits parts of widely different values; the more so as it deviates from the circle in form, for then the annual rings are compressed, and consequently closer on one side than on the other, the side with the wide open rings being usually far inferior in value to the denser and smaller side.

In former times, engravers’ blocks were cut parallel with the grain, the present system of cutting them across the grain being introduced about the middle of the last century. In the preparation of a block, say for a newspaper plate, the parallelograms before spoken of are assorted as to size and fitted together at the back by brass bolts and nuts. So accurately do the edges of the wood fit together, that after the artist has finished his drawing on the smooth face of this compound block, the screws and bolts are loosened, and the pieces separated and given to several men to engrave the design; all that is needed after they have finished their work being to fit the pieces together and screw them up again, when they form one engraved block ready for the printing-press.

Turkey boxwood, from a region of country in the vicinity of the Black Sea, is used for fine engravings. The best is of a delicate yellow colour free from spots or “eyes,” and cuts smoothly without crumbling or tearing.

The tools or gravers necessary in wood-engraving are of three kinds,—viz., gravers proper (_a_); tint tools (_b_); and scoopers, or cutting-out tools, for clearing out the larger pieces (_c_). They are arranged in different sizes, to suit the various portions of the work.[9]

According to Vasari, the important discovery of chalcography or engraving on brass or copper was made by Tommaso Finiguerra, a Florentine goldsmith of the fifteenth century, who lived from 1400 to 1460. The manner in which he made this discovery is thus stated by the Rev. T. F. Dibdin:—

“Of engraving upon copper, the earliest known impression is that executed by one Tommaso Finiguerra, a goldsmith of Florence, with the date of 1460 upon it. One of the following circumstances is supposed to have given rise to the discovery. Finiguerra chanced to cast, or let fall, a piece of copper, engraved and filled with ink, into melted sulphur; and, observing that the exact impression of his work was left on the sulphur, he repeated the experiment on moistened paper, rolling it gently with a roller. This origin has been admitted by Lord Walpole and Mr. Landseer; but another has been also mentioned by Huber. ‘It is reported,’ says he, ‘that a washerwoman left some linen upon a plate or dish on which Finiguerra had just been engraving, and that an impression of the subject engraved, however imperfect, came off upon the linen, occasioned by its weight and moistness.’”

PHOTO-ENGRAVING.

Photo-engravings are produced by means of photography. It is a fact worthy of note that experiments in photographic engraving gave rise to photography itself. The aim of Nicéphore Niepce, when he began his researches in 1813, was not only to fix the image obtained by the camera obscura on a plate of metal, but to convert this plate into an engraving which could be used on a printing-press. His early death prevented his perfecting the process to which he had devoted much time and study.

Three distinct methods of photo-engraving are employed in the United States, viz.: swelled gelatine, photo-etching, and wash-out. The latter is known as photo-electrotyping.

The first steps to produce a plate by any of these processes are exactly alike, _i. e._ a perfectly sharp negative, either in line or stipple, must be produced. If the copy furnished is a wood-cut, steel or lithographic print, in which the lines are absolutely black on white paper or card, the negative is made direct and no drawing is necessary, unless a very great reduction is required, when it becomes necessary to make a drawing, the lines of which are made open enough to stand the necessary reduction. Where the copy furnished is a photograph, or wash drawing, it is first photographed one half larger, or, where fine work is desired, twice the size the plate required. In cases where exceptionally fine work is required it is even made three times the size. The photograph thus obtained is technically termed a silver print, and is an untoned print on plain paper. On this silver print the artist makes his drawing, using the best India ink, which must be so black that the finest hair-line, when examined through a magnifying glass, appears absolutely jet black. After the drawing is made, an alcoholic solution of bichloride of mercury is poured over it, and quickly washed under the tap, leaving the drawing on perfectly white paper. The artist then does whatever retouching may be necessary, and the drawing is ready to be photographed. The advantages of this method of drawing are apparent. The artist, being able to work directly on the enlarged photograph of the object, obtains absolutely correct outlines and detail. The drawing, when finished, is sent to the gallery, where it is photographed to the required size of the plate. The focus of the camera is carefully adjusted with the aid of a focusing glass, so that the negative resulting will be perfectly sharp. This must be carefully done, for unless the negative be sharp a perfect plate cannot be obtained by any process. The sensitized collodion plate is exposed in the camera from one to six minutes, after which it is taken again to the dark room, developed, and fixed. It is then intensified until the portions representing the whites of the picture are perfectly opaque. Up to this point all the processes are alike, and the differences from here will be noted.

If the plate is to be produced by the _swelled gelatine_ process, the negative is varnished and sent to the gelatine room. Here the gelatine is dissolved and the sensitized solution of bichromate of potash is added, and it is flowed on plate glass, then placed in a drying box, where a current of air is continually passed over it. When the gelatine is dry it is placed in a printing frame, in close contact with the negative, and exposed to the light. On removing the negative the picture is plainly seen on the gelatine, the action of the light having changed the color of the exposed portions of the gelatine, besides rendering those parts insoluble, while the parts protected from the action of the light, by the opacity of the negative, remain soluble, and are swelled up by immersion in cold water. The gelatine is then an exact opposite of the plate, the _whites_ being represented by the raised portions. From this mould, or relief, a cast is made in a preparation of wax or plaster, when it is ready for the stereotyper.

For the _wash-out_ or photo-electrotype process, the negative, when dry, is not varnished, but is first coated with a rubber solution and then with plain collodion, after which it is immersed in a dish of acetic acid for about five minutes, when it is stripped from the glass and turned over. It is then what is termed a reversed negative. The method of preparing the gelatine is very much the same as for the _swelled_ process, with the exception that it is _cooked_ for about forty-eight hours, and with the addition of several preparations which are introduced at the time of sensitizing, to make it easily washed out. The negative is exposed in the same manner as described before, but the time of exposure is generally less. After being taken from the printing frame the gelatine is gently scrubbed with a line brush, and kept in tepid water until a very slight relief is obtained. It is then immersed in alcohol for a few seconds, and dried with a cloth, when it is covered with a preparation of lamp black and glycerine, which is allowed to remain about five minutes, when the surface of the plate is carefully rubbed with clean muslin, exposing the surface of the lines,—all this being done in a dark room before an orange light, which is non-actinic. The gelatine is now placed in a frame and exposed to the light from five to twenty minutes, the lampblack protecting the spaces between the lines from the action of the light, so that those portions remain soluble. The gelatine is again scrubbed until the proper relief is obtained, after which it is allowed to dry for about twelve hours, when it becomes hard and is ready to be electrotyped.

The negatives for photo-etching are stripped and reversed in the same manner as for the _wash-out_ process. The metal generally employed for this process is zinc, though copper is sometimes used for very fine work. The zinc is very highly polished, and a thin sensitizing solution is flowed over it and dried, after which it is exposed under the negative to the action of the light. It is then rolled up with lithographic ink, placed in a dish of cold water, and gently rubbed with absorbent cotton, the ink readily leaving the unexposed parts, but remaining on the exposed lines or dots. It is then quickly dried and dusted over with dragon’s-blood powder, which adheres only to the remaining inked portions. The plate is then heated and cooled, and is ready for the etching bath, which consists of a small portion of nitric acid and water. After the first _bite_ the plate is again powdered, heated and cooled, and more acid added to the bath. This is repeated several times, after which the plate is ready for the press. The sides of the lines are protected by the manner in which the powder is applied after the first _bite_. The relief obtained in this way is greater than can be obtained by any other process.

In reviewing the three processes above described, it is readily seen that the photo-etching process is the shorter method, no moulding or casting being necessary, and the sharpness of the finest lines is preserved in a manner impossible by the other methods. The plates are much deeper, and are equally suitable for the finest art work, down to the roughest newspaper work. This process, of which there are several modes of operating, has become very popular in the last few years, owing to the many improvements introduced by the _process inventors_, who have turned their attention to it. It has many advantages, among which is the fact that a plate can be put on the press within two hours from the time the copy is ready; and the wearing capacity of the plates is greater. By this process more than 300,000 impressions have been taken from plates of fine work, while swelled gelatine plates of the same character of work would not stand over 5000, and electrotypes 50,000 impressions. The main advantage of photo-etchings to the printer is, that the plates do not require constant washing up, as is the case with plates made by the other processes.