~ . UBRAftV OF THE yevmstf OF m “touch me not.” (From the Original Terra-Cotta by George Tinworth, by permission of Messrs. Doulton & Co.) POTTERS THEIR ARTS AND GRAFTS. JOHN C. L. SPARKES, ( Principal , Royal College of Art , South Kensington Museum ), AND WALTER GANDY. A PANEL BY GEORGE TINWORTH. PREFACE. T HE most superficial study of the Potter’s art is sufficient to suggest the immensely varied nature of the interests — historical, ethnographical, artistic, technical — involved in its consideration. Many have been the volumes written upon the subject as a whole, or dealing with it in various separate aspects. In fact, there is perhaps no other handicraft that can compare with this, in the extent to which it has been the subject of literary treatment. And there seems little reason to add yet another to the long list of works dealing with pottery, except that there may perhaps be room for a sketch that, without ignoring altogether the technicalities of the subject, will deal more especially with the craftsmen. For the art of pottery is so essentially human! In it, more than in any other, can we see the personality v VI PREFACE. of the worker. It is full of a vital interest, from its oldest and most shapeless relic down to the most modern and costly production from our huge present- day hives of industry. No other material has recorded, or can record, so faithfully as burnt clay, the minutest touch and individual feeling of the craftsman. Here, on a tiny cylinder, or a block of brick, disinterred but yesterday from the rude mound that covers the long-ago forgotten city of a vanished empire, is the little stamp that gives the name of the builder of the once majestic pile ; here, scrawled across the base of a Greek cup is the name of artist and assistant, and the purpose for which the piece was made ; here, on some queerly- shaped posset-cup of our own English manufacture of 200 years ago is an oddly spelt “ God bless the Queen and Prence Gorg e . Drink and be mery and mary : B.B. John Meir made this cup, 1708.” And there, lurking under the base of a beautifully finished vase of modern manufacture, we shall find the tiny impressions, little stealthy marks and modest monograms that record the share of each skilled worker who in turn helped forward its completion. Even on a Wedgwood vase — for Wedgwood sternly repressed any manifestation of individuality on the part of his work- men — there may sometimes be detected a mark by which an expert will identify the maker. It is remark- able, too, that these personal touches upon many a piece of old pottery, these revelations of the minds and habits of otherwise forgotten workers, will often throw PREFACE. Vll light upon doubtful points in the history of art and literature, and confirm in unmistakable language of form, or line, or colour, theories and speculations which, as far as literary evidence went, would have remained only theories and speculations. The gradual appropria- tion by the potters of one country of decorative features used by others, the sudden growths and cessations of particular styles of work, the different languages used in the inscriptions, even the variations in the forms of the letters composing the inscriptions — these, and similar details, have afforded a rich field of research for those interested in the history of the arts of civilisation. Little did the obscure potter of some bygone day dream that a chance production of his might in the far- distant future excite the keen attention of philosopher, artist, or chemist, and with its primitive art and quaint- ness help in the elucidation of history. To carry art into the things of common life is not given to all. It is, however, the privilege of the potter to do this ; he is fortunate in being able to ennoble the useful into the beautiful ; and many a piece of homely ware produced originally with no idea but that of serviceableness, is now treasured for its simple beauty. It is a commonplace of the historian to remark how very closely pottery reflects the degree of civilisation and artistic attainment of a nation. It is no question of wealth ; costly materials are not asked for by the potter ; he takes a common material and manipulates it with more or less skill, bakes it with more or less care, and there is the story of it embodied for all time. Vlll PREFACE. Whatever there is of interest to us in the piece of work, the workman put there ; the work has become the permanent expression of the workers skill and taste — the material comparatively nothing; the art almost everything. Very often naive and childish enough to our eyes is the art of a bygone day, yet its very imper- fections are charming. The Potters art is at once the most unprogressive and the most progressive of arts. As its essentials are constant — clay and fire — it must always be recreating its ideals by continual contact with Mother Earth. Having its origin in very primitive needs, and utilising a very common and easily- worked natural material, it is not surprising that, even to this day, there should be races whose pottery is of very primitive type, scarcely, if at all, in advance of what was being made 6000 years ago. And yet, we have only to look at the varied manufactures, beautiful, useful, costly, or cheap, that our potters of to-day are producing, to realise that here we have an art that has been and is steadily progress- ing, adding to a practical knowledge whose precepts have accumulated through many centuries, a newer and more precise technical and chemical knowledge that is pointing out new materials, more direct methods of workmanship, and fresh fields for the manufacture to occupy. J. C. L. S. APPENDIX. INDEX. PALISSY-WARE DISH, WITH REPTILES AND FISH. CHAPTER I. PAGE POTTERY PROCESSES, CLAYS AND KILNS, . . . .11 CHAPTER II. ANCIENT POTTERY, 59 CHAPTER III. MEDIAEVAL POTTERY, 113 CHAPTER IV. ORIENTAL PORCELAIN AND POTTERY, AND THEIR EUROPEAN IMITATIONS, 177 CHAPTER V. MODERN POTTERY, . 226 ROMAN POTTERY. POTTERS: THEIR ARTS AND CRAETS. CHAPTER I. POTTERY PROCESSES, CLAYS AND KILNS. I T would be desirable, before entering upon any historical sketch, to briefly summarise the charac- teristics of the different classes of pottery, and make some mention of the materials and processes involved in their manufacture. The term “ pottery” is, of course, applied to all objects formed of clay and hardened by the application of heat. It is certainly a very elastic term, and the master-potter of to-day covers a much wider field with his products than was ever dreamt of when poterium was Latin for “ drinking vessel/’ The essential constituent — clay — occurs in many 11 12 POTTERS : THEIR ARTS AND CRAFTS. varieties. All owe their origin to the decomposition of certain rocks. Centuries of exposure to frosts and rains have split up and worn down the out-cropping surfaces of primitive granite-rocks, the fine silt being washed down the slopes of the hills and gradually deposited along the valleys below, often at great distances away. The purest clay, kaolin, is found at comparatively few places. Chemically speaking, it is a hydrated silicate of alumina, a decomposition of the felspar in the granite. Its more common designation, china clay, reminds us that till last century it was only known as forming the chief material of Chinese porcelain, and it was not till happy accident revealed its presence in Europe and America that true porcelain could be made away from China. Its chief source in England is in the neighbourhood of St. Austell, in Cornwall, and, next to tin, it is the most important mineral product of that county. Pipe clay and potter’s clay occur more frequently than kaolin. They contain a larger proportion of silica; and iron oxide, occurring in larger or smaller quantity, gives the clays their yellow or brown colour when fired. The chief sources of supply for England are the neighbourhood of Poole Harbour, in Dorset- shire, and Newton Abbot and Torrington in Devonshire. With a still larger proportion of silica, the clays become suitable for architectural terra-cotta and tiles, the infusible silica counteracting the tendency of the POTTERY PROCESSES, CLAYS AND KILNS. 13 clay to shrink excessively or twist in the baking. Very valuable clays are found in thin seams among certain coal measures ; thus, the fortunate potter digs his clay and his fuel from the same pit. Certain highly refractory fire-bricks used for furnaces are made from clays composed almost entirely of silica. The more impure clays suitable for bricks are most abundant and varied in composition. The considerable proportion of alkaline matters — lime, magnesia, or potash — which they contain in combination with different oxides of iron, influence the colour to a marked extent. The range of tints available in natural- coloured clays is fairly extensive, running from pale- cream through orange, fawn, red, pink, grey, and blue ; even the intense bluish-black of certain building- bricks being a natural metallic colouring brought out by over-firing. When other tints than these natural ones are desired, certain oxides of other metals than iron are used to stain the substance of the clay ; thus, blues of various shades are obtained from cobalt, greens from chromium, lilac, pink, black and brown from manganese, yellow from uranium, drab from nickel, dove colour by cobalt and manganese, and so on. Very few clays are used just as they are found. They have to be “ corrected ” in various ways ; to add or decrease stiffness, to render more or less fusible, or more or less refractory in the baking. Mixtures of 14 POTTERS : THEIR ARTS AND CRAFTS. clays have, in the majority of potteries, to be resorted to, calling for all the skill and experience of the potter. In continually testing his materials, and experimenting and deciding upon the best use to be made of new sources of supply, the successful potter has to be more or less of a chemist. For chinaware an artificial clay is used, built up of ground flints, kaolin, ordinary clay, and a large pro- portion of calcined bones. The use of the last-named ingredient (giving phosphate of lime) dates from the middle of last century. All the natural clays have a certain amount of water contained in them. Of course, the plasticity of the clay, or its capacity for being moulded or pressed into different forms, is due to this moisture. Some of the moisture ( i.e ., that which is “ mechanically ” combined) can be driven off by evaporation, but the plasticity is soon restored by adding water. Hence the sun-dried bricks used so extensively in ancient Egypt and Baby- lonia, and still used as adobe in Central America, retain their forms for centuries in the dry air of those countries, but would not have lasted a year in our more humid atmosphere. There is present, however, water in “ chemical ” combination with the clay — sometimes only in small quantity — and this, once expelled by baking, cannot be replaced. The burnt clay, though powdered as fine as may be, will not regain its plasticity on the addition of water. POTTERY PROCESSES, CLAYS AND KILNS. 15 Pottery may be roughly grouped into three main divisions, according to the nature of the body or sub- stance (Fr., pate ) : — Earthenware . — Fired at low heats; earthy in texture; sufficiently soft to be scratched with a knife. Stoneware . — Fired at high heat ; hard, dense, and vitreous ; not scratched by a knife. Porcelain . — Fired at highest heat; still more vitreous, semi-fused, and often translucent. It is impossible, however, to make a quite precise classification of pottery bodies ; there are many inter- mediate conditions arising from the variable nature of the clays and their mixtures, or from the effects of varying degrees of heat. Some earthenwares can be fired so hard as to practically become stonewares, while some fine stonewares will exhibit almost the perfection and translucency of hard porcelain. As a general rule, it may be said, clays suitable for earthenware will not retain their form if baked harder than earthenware need be fired ; similarly, a stoneware clay, if over-fired, is liable to fuse down into a shapeless mass ; while for the highest heat of true porcelain only its special clays are available ; clays that, as we shall see in the following pages, European potters were for centuries seeking in the attempt to rival the beautiful porcelain from China. Such a simple grouping of pottery refers only to the body . An earthenware clay when baked will present an earthen and more or less porous surface, capable of 16 POTTERS : THEIR ARTS AND CRAFTS. absorbing liquids, and easily soiled. Such a body is called terra-cotta (Italian, burnt earth), or biscuit (which really means twice baked , and is therefore rather inappropriate to a once-baked clay; the term terra-cotta , too, is now made to mean rather more than a merely baked earth, for architectural terra-cotta — blocks for building purposes — has to be fired hard enough not to be porous, as hard as stoneware in fact). When pottery was first made, it must soon have been found that the merely baked ware was not altogether desirable for holding liquids. To invent a glaze then, or glassy covering, was a great step in advance, and the usefulness and durability of pottery have by the use of glazes been immeasurably enhanced ; often, indeed, the glaze is of more importance, harder and finer in com- position, than the body it may cover. The consideration of the different methods of glazing makes it possible to sub-divide the group of earthenware into — (1.) Unglazed, as for instance, a common flowerpot. (2.) Ware with transparent, glassy covering — (i a ) Alkaline — as in Persian faience. (b) Plumbiferous (formed from lead) — as in Wedgwood's “ Queen’s" ware, and the “ Oiron ” ware. (c) Boracic (formed from borax) — as in Staffordshire earthenware. (3.) Enamelled ware, in which the body is hidden by POTTERY PROCESSES, CLAYS AND KILNS. 17 an opaque coating formed with tin — as in Della Robbia and Delft w^ares. In a general way, divisions (2) and (3) may be spoken of as Faience , and (3) especially as Majolica . These designations will be further dealt with when speaking of Italian pottery. The group of Stoneware will also fall into three divisions of — (1.) Unglazed — as in certain Chinese and Japanese wares. (2.) Ware with transparent glaze (generally a salt glaze) — as in the common brown “ hunting- jug,” or “Doulton” ware. (This ware is sometimes referred to as “ Brown Porcelain.”) (3.) Ware with enamelled or opaque covering (gener- ally from the use of felspar) — as in, for instance, a cream-glazed stoneware kitchen sink. (Ware of this kind is sometimes styled cream-enamelled porcelain.) Porcelain is divided into two well-marked classes, and these sub-divided according to their bodies and glazes : — (1.) Natural or Hard Porcelain, in which the body is formed from kaolin (decomposed felspar), and the glaze from china-stone (almost pure felspar). Occasionally, this ware is left in the un- glazed or biscuit state, otherwise it is generally B 18 . POTTERS : THEIR ARTS AND CRAFTS. glazed, as in the porcelain from China, Japan, Dresden, Limoges, and Sevres. (2.) Artificial or Soft Porcelains — (a) French. — Body formed from alkaline materials (saltpetre, sea salt, alum, soda ash, gypsum and sand melted together, ground, and mixed with chalk and marl) ; the glaze also alkaline (composed of lead, sand, flint, soda, and potash). The old Sevres porcelain comes into this class. (b) English or “ China,” as it would be now generally styled. — Body of calcareous nature (bone ash, kaolin, china-stone or felspar, flint, and sometimes clay) ; the glaze generally boracic (formed with borax). Minton, Worcester, Derby, Bow, and Chelsea porcelains may be instanced as examples of this group. Some of the earlier bodies, however, approxi- mate more in their composition to the French type, and the glaze contains lead. From the Derby, Chelsea, and Bow works proceeded many pieces (mostly statuettes) in unglazed biscuit of pure white. This leads to the mention of parian , an artificial body used for unglazed models, with a large proportion of felspar, and almost approxi- POTTERY PROCESSES, CLAYS AND KILNS. 19 mating in composition to the unglazed biscuit of hard porcelain. A few words now as to the more obvious processes of manufacture, and it will be convenient to speak first of the simpler methods of stoneware. The raw clays (principally the “blue,” “ball,” or potter’s clay from Dorsetshire and Devonshire), are cut out from the pit in squared lumps. The deposits are at some distance below the surface, and the purest clay is the lowest reached ; the upper beds generally contain more sand, and are of a nature that for some kinds of ware require but little preparation. The blue or grey tinge in the clay is due only to the stains from organic matter, and will disappear in the burning. Arrived at the pottery, the clay is stacked up and allowed to “weather” for a longer or shorter period. Some potters attach more value to this preparation than others ; it is not uncommon for the clay, in some cases, to be used at once, while it has been stated that the materials for Chinese porcelain are allowed to weather for a great number of years. All materials are well and thoroughly ground. At all stages of the manufacture there must be good workmanship ; if the clay when used is not quite similar throughout — perfectly homogeneous — inequali- ties will manifest themselves in the firing. The lumps of dry clay are ground to powder under pairs of iron runners ; the powder falling over the edge of the pan 20 POTTERS : THEIR ARTS AND CRAFTS. is sifted automatically, the coarser particles are returned for more grinding, and the fine dust is carried off by buckets on an endless chain to a recep- tacle from which it is fed as required into a “ blunger ” or mixing-pan. Here is added a due proportion of ground “ rough stuff” (broken burnt ware which has also been “ under the runners ”), water is poured in, and a rough sort of mixing takes place, the revolving arms of the blunger churning the mass over and over. It falls into a “ pug-mill,” whence, having been squeezed in and out, and cut through again and again, it is forced out in a condition almost ready for use ; some- times, however, where finer work is intended, it is again fed into a second pug-mill. The plastic clay is now ready for the “ thrower’s wheel,” or the “ squeezing- box,” or the moulding-bench. Such a clay would be described as unwashed. For fine stonewares, and for earthenwares, the clays are washed , and the processes now to be described take place in the slip-house. The ingredients — we will speak of those for earthenware — having been prepared separately (the ball clay and kaolin in the blunger, the calcined flint and cornish stone brought to fine slips, in the stone mill), are all fed into the mixing-tank. The density of each has been carefully tested (the weights per pint averaging respectively — kaolin, 26 oz., ball clay, 24 oz., flint, 32 oz., cornish stone, 31 to 32 oz.), and the right quantities having POTTERY PROCESSES, CLAYS AND KILNS. 21 been measured, and any colouring stain added if desired, the mass is stirred together, strained through lawns of graduated fineness, passed along a trough in which magnets are suspended that any lingering iron may be caught, and so to a store tank. From here the mixture is pumped up to the press, which is an elabor- ate arrangement of wooden frames (usually twenty-four in number) placed up on edge in a row. Each frame has a cloth of specially woven material, folded to form a kind of flat bag, each with a small feeding pipe communicating with the main supply. Long clamps hold the frames all together. The pump being started, the slip is forced into the frames, the excess of water filtering out through the cloths and running away in the channels under the apparatus. When the water ceases to flow, the pump is stopped, the bolts are loosened, the frames opened, the cloths unfolded, and the soft clay lifted out. This is not a rapid process, and where the bodies are varied in colour or otherwise, the cleaning of the filtering-press occupies some time. The clay — not yet suitable for use — is fed into the hopper of a pug-mill, in which it is compressed still further and beaten together. Exuding from the mill in a fairly solid stream, it is carried away to the “ makers.” Even there it is still further beaten and tossed about so that any imprisoned bubbles of air may be expelled before the “ thrower ” will use it. This final cutting and throwing together again is 22 POTTERS : THEIR ARTS AND CRAFTS. called “ wedging/’ and is splendid exercise for the arms of those who have to indulge in such violent labours. There are, of course, minor details in the preparation of clays that it is impossible to mention. Not all will need such careful treatment. A clay intended for bricks will not perhaps pass more than one mill. Some rough clays used for squeezed wares can be put just as they are dug from the earth into the squeezing- box, while some fire-clays entail a kind of “ steaming ” operation. The clay in this case, having been ground up and the due proportion of broken stuff added, is mixed in water, and run out along a sloping trough with slight hollows in its surface. Here the coarser particles settle ; what passes over goes to an iron tank surrounded by a steam-jacket. The excess of water being evaporated off, the clay now goes through a pug- mill, or is beaten by hand. Most of the old and arduous hand-methods of clay preparation have been fortunately given up in favour of machinery. Much can be said of the various ways of forming pottery. The most characteristic, and certainly the most interesting to watch, is that which is known as “ throwing ” on the wheel, one of the oldest of pro- cesses in the world. As represented in a wall painting at Beni-hasan, the ancient Egyptian potter squatted on the ground, and turned his wheel by one* hand THROWING, 23 POTTERY PROCESSES, CLAYS AND KILNS. 25 while forming the vase with the other. The Greek wheel was turned by the foot, a method that was in vogue until quite recently. Where steam-power is available, it is but natural to use it for small and quickly-made articles ; but larger vessels and any- thing requiring extreme care are still “ thrown ” on a hand-wheel, the motive power being supplied by an assistant, who can turn faster or slower at word of command, and leave the thrower to concentrate all his attention on the work in hand. The idea of the wheel is simplicity itself : a horizontal revolving disc, the fingers of the workman, and the lump of clay between them — that is all. Thrown on the centre of the disc, the ball of moist clay is manoeuvred as it revolves by those skilled fingers ; — “ opened out,” brought in again, brought up to a neck, mouth turned out, lip formed by a touch of the finger — and there is a jug complete all but for the handle. A few simple bits of horn to clean off with, a gauge for height to be used or not as the case may be, a wire to sever the object from the wheel, and a pan of water, and that completes the “ throwers ” outfit. A most fascinating handicraft, and one that numbers among its humble followers many a real artist ! Many common articles (of circular form, it must be understood) are finished on the wheel. Such would be ink-bottles, ginger- beer bottles, and so on. An approved pattern having been weighed, the same 26 POTTERS : THEIR ARTS AND CRAFTS. weight of clay is made to reach to the same height in each case, and it will be found that the capacities do not very appreciably vary. Most pieces, however, require to be “ lathed,” to remove any excessive thick- ness, or any irregularities of surface. This can easily be done, as soon as the clay object has acquired suffi- cient stiffness by _ drying. It has been sometimes objected that this second process of lathing destroys the characteristic feeling of a “ thrown ” piece of work, and this is, without doubt, true. But it is also true that by lathing we can have shapes more light and graceful than could be made and finished on the wheel,