THE MANUFACTURE OF SUGAR
Extract from 
"The Useful Arts and Manufactures of Great Britain" - London, 1846

As sugar is most abundantly supplied by the sugar-cane, much interest has been excited respecting the early history of this plant. It has been supposed that the Hebrew word, which frequently occurs in the Old Testament and is sometimes translated calamus, sometimes sweet-cane, means the sugar-cane. It is mentioned for the first time in Exodus, where Moses is commanded to make an ointment with myrrh, cinnamon, sweet calamus, cassia, and oil olive.

The calamus does not appear to have been a native of Egypt or of Judaea; for in Jeremiah it is mentioned as coming from a far country. “To what purpose cometh there to me incense from Sheba, and the sweet-cane from a far country?” It has been argued, that if the cinnamon mentioned in the passage of Exodus were true cinnamon, it must have come from the East Indies, the only country in the world from which it is obtained; and that it is therefore, highly probable that the sugar-cane was exported from the same country.

Among the ancient writers of Greece, Herodotus alludes to the “honey made by the hands of men. Nearchus, Alexander’s admiral, relates that “the reed in India yields honey without bees.” Theophrastus describes three kinds of honey; one from flowers, another from the air, (referring probably to honey-dew,) and a third from canes or reeds. Other ancient writers are more or less precise in their mention of sugar, until we arrive at the time of the Roman Emperor, Nero, when Dioscorides uses the word saccharum, or sugar: his description refers to a species of sugar-candy, but he was evidently not aware of the mode of preparing it. He says: “There is a sort of concreted honey, which is called sugar, found upon canes in India and Arabia, Felix: it is in consistence like salt, and it is brittle between the teeth, like salt.” Seneca was also ignorant of the real character of sugar: he describes it as honey found on the leaves of canes, and produced by the dew or the sweet juice of the cane itself concreting. Pliny describes sugar as brought from Arabia and India: “It is honey collected from canes, like a gum, white, and brittle between the teeth; the largest is of the size of hazel-nut; it is used in medicine only.” Galen, who wrote in the second century, also speaks of sugar; and in the seventh century, Paulus Aegineta quotes an earlier writer, who describes sugar as “the Indian salt, in colour and form like common salt, but in taste and sweetness like honey.”

It appears that, during a long period, the sugar cane was confined to the islands of the Indian Archipelago, the kingdoms of Bengal, Siam &c., and that the sugar was imported with perfumes, spices and other merchandise, to the countries on this side of the Ganges. The traffic in sugar being lucrative, the Indians concealed the knowledge of the sugar-cane: they informed the merchants at Ormus that they extracted sugar from a reed, whereupon many attempts were made to obtain it from the reed-like plants of Arabia; but these were all unsuccessful.

The doubts respecting the real nature of sugar were not resolved until the year 1250, when Marco Polo visited the country of the sugar-cane. On his return, the merchants, who had hitherto purchased sugar at Ormus, repaired to the country of its growth. They brought away the sugar-cane and the silk-worm, and from Arabia Felix these valuable productions passed into Nubia, Egypt, and Ethiopia, where sugar was soon produced in abundance, although its quality was very inferior, from ignorance of the means of preparing the juice. In 1420, the Portuguese introduced the sugar-cane from Sicily to Madeira; and, during the same century, it was probably carried from Spain to the Canaries. So successful was the cultivation that the sugar of these countries was preferred to any other. The Portuguese also successfully transplanted the sugar-cane to the island of St. Thomas and other islands on the African coast. Soon after the discovery of the New World, the Spaniards established sugar-works in Hispaniola, or St. Domingo: workmen were sent from the Canaries to manufacture the sugar, and the cane flourished so well, that its produce afforded a large revenue to the mother country. In 1641 the cane was transplanted from Brazil to Barbadoes, and thence to the other West India Islands.  

For a long period the use of sugar in England was confined to medicines and feasts; and this continued until 1580, when it was brought from Brazil to Portugal, and thence to our country.  

Mr. Porter remarks, that “The merchants who introduced the cane from India certainly neglected to bring, also, the necessary instructions as to the methods of preparing the juice; and the difficulties which the Arabian cultivators experienced, doubtless caused them to try the use of all kinds of ingredients for its purification, and to invent conical vessels for crystallizing and cleansing the sugar.” The Venetians introduced the art of sugar refining into Europe at the end of the 15th century. At first they imitated the Chinese and sold the sugar which they purified in the shape of candy, cleaning and refining the coarse sugar of Egypt three or four times over. They afterwards adopted the use of cones, and sold refined sugar in the loaf. This example was soon followed by the establishment of sugar refineries in all the commercial cities of Europe.  

Varieties and Sources of Sugar  

We are accustomed to associate sugar only with the sugar-cane, yet it is one of the most abundant productions of the vegetable world. It is found in a liquid state in most plants; it is manufactured from beet-root, from the sap of the maple, and other vegetable bodies; and this wide distribution of so valuable an article of food is one out of the many instances of the bounty of Providence in supplying our wants.  

Of the numerous varieties of sugar, some can be made to ferment, others not; some can be formed into crystals, others not; but it often happens that two kinds of sugar are mixed, as in the sugar-cane, the juice of which yields the finest crystals, and also molasses, or treacle. The size of the crystals, however, depends greatly upon the mode of treatment: when they are rapidly formed, as in common refined sugar, the crystals are small and confused; but when obtained by the slow evaporation of a strong solution, they are large and transparent, as in sugar-candy.  

Sugar is the principal food of the vegetable world. It exists largely in the succulent parts of the plants and seeds when they begin to shoot. It is formed in several kinds of seeds in the process of malting, which consists merely in steeping seeds in water until they sprout. In the ripening of many fruits there is a similar change.  When palms are about to flower, the starch contained in their stems is changed into sugar. If plants are allowed to flower, the gum and sugar disappear from the roots or stems: this change applies to such common roots as the parsnip, carrot, beet etc, as well as to the sugar-cane maize, and other plants rich in sugar matter. The stems of grasses are also sweet at an early stage of their growth, when they are most nutritious and palatable to cattle, a circumstance which ought to regulate the time for making hay. In certain trees the starch formed in autumn is converted into sugar by the ascending sap in spring, and sugar is formed in considerable quantities from the sugar-maple. The sap of the birch-tree, on being fermented, yields an agreeable beverage, called birch-wine.  

The juice of grapes furnishes a peculiar kind of sugar, called grape-sugar, which has been traced in many fruits, such as pears, peaches, cherries, melons, dates, figs and the chestnuts which grow in warm countries. Grape-sugar is also formed in the nectarines of many flowers and is collected by bees; hence honey belongs to this variety of sugar.  

Grape-sugar can be procured from starch by the action of dilute sulphuric acid. Lignin, or woody fibre, or any substance containing it, can also be converted into sugar by the same means. If sawdust, linen-rags, paper, or other ligneous substance, be rubbed up with sulphuric acid, and the acid afterwards removed by adding an alkali or some powdered chalk, the ligneous body will be changed into a species of gum, which, being boiled for some hours in a weak acid, is gradually converted into sugar. It has been well observed that, “however clumsy and inconvenient this process is in our laboratories, being, as we are, but Nature’s journeyman, Nature herself carries on these transmutations with the most wonderful results, as we see in the ripening of fruits, when the hard woody texture gradually softens down into sweet and luscious pulp, as in the ripening of the pear, the grape, the strawberry, and, in short, almost all fruits.”  

The above varieties of sugar are granular or crystalline, and are all capable of undergoing the venous fermentation. The only sugar which refuses to crystallize, but which can be fermented, is the molasses which remains after refining cane and other sugars, and this is largely used in the distillation of rum. Sugar of milk and manna sugar do not ferment. The former, sometimes called Lactine, is obtained by evaporating the whey of milk; the latter, also called Mannite, is contained in the manna which exudes from several species of ash: it is also found in the bark of the olive tree, in some species of pines, in the root and leaves of celery, in the bulb of the onion, in many kinds of sea-weed, and in couch grass. By long exposure to the air the juices of many plants, such as beet, carrot, generate manna sugar.  

Sugar is extensively employed to preserve animal and vegetable substances, such as meat, fish, fruits, jellies and many medicinal substances; and in some cases is preferable to salt in not destroying the true flavour of animal food. The sugar which is naturally formed in many fruits is sufficient to preserve them, as in raisins, figs, and other dried fruits.  

In temperate climates sugar is rather a luxury than a necessary of life; but in tropical countries it is extensively used as an article of food, and has been ranked inferior only to corn. Enormous quantities of sugar-canes are sent from the sugar islands to the markets of Manilla, Rio Janeiro, and the surrounding countries. The crude plant is called Dutrone, “the most perfect alimentary substance in nature,” and this praise does not seem to be exaggerated when we consider its effects upon the Negroes at the time of cane-harvest. “The time of crop is in the sugar islands,” says Mr. Edwards, “is the season of gladness and festivity to man and beast. So palatable, salutary, and nourishing, is the juice of the cane, that every individual of the animal creation, drinking freely of it, derives health and vigour from it use. The meagre and sickly among the Negroes exhibit a surprising alteration in a few weeks after the mill is set in action. The labouring horses, oxen, and mules, though almost constantly at work during this season, yet, being indulged, with plenty of the green tops of this noble plant, and some of the scummings from the boiling house, improve more than at any other period of the year. Even the pigs and poultry fatten on the refuse.”  

In separating the sugar from the juice some of the nutritive substances are removed; and it should not be forgotten, that the praises bestowed on sugar by different writers on this subject apply to the fresh juice of the cane, and not to the crystallized sugar in use among ourselves.  

Sugar Refining  

The process by which raw or brown sugar is converted into white sugar are of a striking and interesting character. Of late years they have been subject to considerable improvement, and they now partake largely of the scientific character of our most important manufactures.  

The principle sugar refineries in London are situated in Whitechapel and its neighbourhood: most of them are extensive buildings, each consisting of seven or eight stories; the rooms, or working-floors, as they are called, present a singular appearance. Each floor is paved with stone, is of small height, and the ceiling is formed of brick arches, supported on iron pillars; the object being to render the building fire-proof and of great strength, and also to provide an extensive surface for arranging the sugar in the different stages of the process. A square opening is left at the side of each floor, over which, in the top floor, is a crane, for the purpose of removing the sugar as occasion requires.  

The reader may perhaps be able to form a tolerably accurate idea of the art of sugar refining, from the following attempt to trace the sugar from its raw to its refined state. The description applies to an extensive refinery at Whitechapel (Messrs Fairrie’s), which, in company with an artist, the writer was privileged to visit.  

 

Sugar from the West Indies is packed in hogsheads, and that from the East Indies in canvas bags, covered with matting. These are received into the first floor of the refinery, situate in a little above the street, where they are broken open and unpacked by the side of a large circular vat or cistern, which is pouring forth clouds of steam, and filling the floor with an oppressive sickly vapour. In this cistern, the sugar is first mixed with water, with the addition of a small quantity of lime water and bone black. Heat is applied by means of steam, which issues from a number of small copper pipes, contained at the bottom of the vessel, and from this method of applying heat the vessel is called the blow-up cistern, the steam forcing itself by its own pressure, or blowing up, through the mixture. The perfect solution of the sugar is promoted by stirring with long poles. Shortly before the liquid has attained the boiling point it is allowed to flow along a channel into a filtering apparatus, situated in the room beneath; on leaving which it appears as a clear reddish syrup.  

The chief object of this process is to separate mechanical impurities, such as dust, dirt etc. from the sugar. Until within a few years the process was conducted in a ruder and far less direct manner. The raw sugar, mixed with lime-water, was heated in a large open copper by a fire from below, and when warm a considerable quantity of bullocks’ blood, technically called spice, was stirred in. The serum or watery part of the blood, (consisting chiefly of albumen, of which white of egg is a familiar example) becoming curdled by the heat, and entangled most of the impurities floating in the solution raised them to the surface in the form of a thick scum, which was carefully removed. This process was sometimes repeated two or three times, with fresh quantities of blood, and from the scummings a low quality of sugar was afterwards obtained. The liquor being thus clarified, was filtered through a thick woollen cloth, and afterwards boiled in an open copper until sufficiently concentrated for graining. So imperfect was this method, that, in order to produce loaves of the finest quality, a second refining was necessary; the loaves first produced were broken up and re-dissolved, and clarified with white of egg; this being carefully skimmed off, a small portion of indigo was added, the effect of which was to neutralize the yellow colour of the syrup. These costly methods, which of course greatly increased the price of sugar, are now rendered unnecessary; for, in the modern process, a clear liquor is obtained without the aid of so offensive a substance as bullocks’ blood, a portion of which generally become entangled with the sugar, and was not separated by crystallization.  

The filtering apparatus now in use, is arranged in an ingenious manner. It consists of square vessels of iron, about eight feet high, connected with cisterns above and below, and containing a number of twilled cotton cloth tubes, closed at the lower ends, but open at the upper ends, which are screwed into the floor of the upper cistern. Within each tube is a bag of cotton cloth, which, being considerably wider than the tube, hangs down in folds. About sixty tubes, thus arranged, are contained in each filter, so that by this means an extensive filtering surface is obtained; the liquor from above, having to pass through the meshes of the cloths, is strained of most of its solid impurities, and a clear reddish syrup drops into the cistern below. The bags soon become clogged up, and are frequently removed for the purpose of being cleansed. A black viscid mud is scraped off, but, as this contains a portion of saccharine matter, it is again boiled and otherwise treated before it is transferred to the dealers in manure.

 

It is obvious that, in order to produce white sugar, the syrup or liquor must be without colour. When it leaves the filters it is of a dark red colour, and to remove this is the object of the next process, the introduction of which is one of the great modern improvements in the art of sugar refining.  

Chemists have discovered the existence of a remarkable attraction between animal charcoal and the colouring matters furnished by animal or vegetable substances. This kind of charcoal (or as it is sometimes called, bone-black, or bone-charcoal) is produced by heating bones to redness in a close vessel, or when covered over the sand. The bones lose about half their weight by being calcined; they are then pounded in a mill into a coarse granular state like gunpowder, in which they are fit for use.  

The charcoal filter at Messrs Fairrie’s are oblong vessels, about five feet in height furnished with a double bottom, the upper one being pierced with holes and covered with cloth to prevent the holes being choked up and the particles of charcoal being carried away by the liquor. The charcoal is heaped up on this cloth to the depth of three feet, and the reddish liquor from the cistern above is allowed to flow in a gentle stream over the surface; it slowly sinks through the mass, gradually losing its colour, until it arrives at the space below, when it is colourless. A series of pipes and siphon tubes from the various “charcoal cisterns” as they are called, conveys the filtered liquor into reservoirs, whence it is pumped up to the sugar boilers in the room above.    

In the course of a few days the charcoal becomes foul and unfit for use. Water is passed through it to remove all saccharine matter, and it is then taken to the retort-house and re-calcined, a process which restores all its valuable properties.  

The next process which the liquor undergoes, namely, the boiling preparatory to crystallizing, is one of the most important in the whole range of operations to which the sugar is subjected. By the old method the syrup was concentrated in the open pans, standing over fires, and heated to 240° or 250° Fahr. This high degree of heat was very injurious to the sugar, for it changed a large portion of it into treacle, which had to be got rid of in the moulds. The method was also objectionable on account of its danger, and the difficulty of managing the heat. Many plans were adopted for heating the liquor, by passing steam pipes through it, or hot oil under it, but they were all superseded by the valuable invention of the Honourable Edward Charles Howard, now in general use under the name of Howard’s vacuum-pan, first introduced in 1813. The principle of this invention rests on the fact, that the boiling points of all fluids are considerably lowered by placing them in vacuo. Thus, under ordinary circumstances, water boils at 212°, the pressure of the air, which is equal to about fifteen pounds on every square inch of surface, preventing the rapid formation of vapour at a lower temperature; but if water, at the temperature of 90° or 100°, be placed under the receiver of an air-pump, and the air be exhausted, the water will boil rapidly and pass off in vapour. The object, therefore, which the inventor of the new method had to view was to collect a sufficient quantity of syrup in a closed vessel placed in connextion with an air-pump; then to remove the air, and apply a very moderate degree of heat, by which means the syrup could be boiled at a low temperature, and brought down to the granulating pitch. After numerous trials and failures the inventor was rewarded with success, and continued during several years to derive a large income from premiums paid by sugar refiners for permission to use the patent process. The patent having now expired, no restriction is placed upon its general use.   

 

The vacuum-pan consists of a large copper vessel, about six feet in diameter, supported on legs, so that every part may be conveniently inspected. The lower part of the pan is double, for the purpose of letting in the steam which is used to heat the syrup: within the pan, in contact with the syrup, is a coil of copper pipe, through which also steam is passed. The bottom cavity, or steam-jacket as it is called, is supplied with low pressure steam, but the spiral pipe is filled with high pressure steam, which is considerably hotter than boiling water, and greatly promotes the evaporation of the syrup. From the centre of the dome rises a neck, which, by means of a bent tube and other apparatus, connects the interior of the pan with the air-pump used for extracting the air and vapour. The interior of the pan is also connected by means of pipes with vessels containing the clarified syrup which may by situated in the upper stories, or in the charcoal-filtering room below. In the former case, the syrup runs down into the pan on turning a stop-cock in the pipe, and in the latter case it rises by atmospheric pressure, as soon as a partial vacuum is formed in the pan. The pan is furnished with a barometer or manometer, for showing the state of vacuum, and also with a thermometer, for indicating temperature. There is also a cistern-pipe for receiving any syrup which may accidentally boil over; but the too rapid boiling, and also the danger arising from the pressure of the air on the outside, which might crush in the pan, are prevented by a safety valve, which admits air in case the exhaustion should at any time be made too perfect. There are numerous other minor details, which need not be particularised.  

The pans generally contain each about 100 gallons of syrup, which yield about eleven cwt of granulated sugar at every charge. Sometimes the pans are of larger dimensions. Dr. Ure mentions one in use at a London house, which works off eighteen tons of sugar-loaves daily.  

The pans being properly charged, and steam admitting within the steam-jacket and the coiled pipe, and the air-pump is set in action, its moving power being supplied by the steam-engine of the establishment; the syrup soon attains a temperature of about 130°, when it boils, and throws off vapour of water, which is pumped off, and condensed in a vessel placed in the open air, over which a steam of cold water is constantly flowing. As the syrup becomes more concentrated, its boiling point becomes higher: the temperature is, therefore, gradually raised to about 150°, which is about 100° lower than would be required for open vessels. The attendant is enabled to watch the process by means of a very ingenious contrivance, called a proof-stick. This consists of a cylindrical rod, exactly fitting a hollow tube which enters the pan in a direction slanting downwards. The upper end of the rod is open; the lower end, which dips into the syrup, has a slit on one side of it, about half an inch wide. Within this tube is another shorter tube, which can be moved round in it through half a circle: near the lower end of this tube is a lower hollow which corresponds with the slit in the outer tube; and the upper end is connected with a handle. By making the slit and the cavity coincide, the latter is filled with sugar; then, by turning the stick round through half a circle, the slit is covered by the fixed tube, and the inner tube can then be drawn without allowing air to enter the pan.  

The sugar is tried by the touch, as already explained: the small crystals which appear in it are examined, and the moment the liquor has attained the granulating pitch, the connection of the pan with the air pump is cut off, air is admitted to equalise the pressure, and a plug at the bottom of the pan is opened, by means of a lever attached to it, when the whole of the syrup flows down a pipe into a receiver situated in the room below.  

In our notice of the process of sugar-boiling in the West Indies, it was stated that, as soon as the syrup was boiled down to the point of granulation, it was transferred to a vessel called a cooler, the process of boiling in open vessels raising the liquor to so high a temperature, that cooling is absolutely necessary to crystallization. The introduction of vacuum pan has wrought a curious change; for, after the boiling is complete, the syrup is removed, not to a cooler, but to a heater, where it is raised to the temperature of 180° or 190°, the object being to make the syrup more fluid than the comparatively low temperature of the pan admits of, and also to prevent crystallization before the sugar is poured into the moulds; for, were this to take place, the colouring matter would be so imbedded in the mass of crystals, that no after treatment, short of re-melting, would get rid of it. Not only, therefore, is the temperature of the syrup raised, but men are employed with poles in beating and stirring it up, where it is being removed to the moulds.  

The heater is a shallow vessel of copper, surrounded with an iron steam-jacket for keeping up proper degree of heat. The syrup which flow into it from the pan is no longer a limpid, colourless fluid, as it was in the filter-cisterns; it is now exceedingly thick and viscid, and the process of boiling has concentrated the colouring matter, the molasses, and uncrystallizable parts of the sugar, to get rid of which is one of the objects of the concluding processes.    

 

The sugar is next removed to moulds in the fill-house, which is situated in the lowest story, and on a level with the heater. The conical sugar moulds are made of brown earthenware, or of sheet iron well covered with paint; the pointed ends are open; and the moulds vary in size according to the quality of the sugar, the largest moulds being used for the inferior sorts. At the time of the writer’s visit to the fill-house, one set of men were engaged washing the moulds, and putting them up in piles to drain. A second set rolled these piles to another part of the floor, and placed them one by one, with their points upwards; a third set were occupied in twisting pieces of paper, with which they plugged up the holes in the moulds; a fourth set were setting up the moulds, points downwards, an operation simple in appearance, but requiring a level floor, and that kind of ready skill which can only be attained by long practice. Beginning at one corner, the moulds were arranged in ranks, four or five deep, along the whole length of the floor. A fifth set of men, eight or ten in number were engaged in filling the moulds; each man was naked from the waist upwards, and was furnished with a copper basin, which he filled at the heater by opening a kind of sluice at the side, and then with a rapid step conveyed the syrup to the moulds, and poured it into them. Each man carried enough to fill one mould, and about half of another. A sixth set of men immediately stirred round the sugar in the moulds, to diffuse the crystals equally through the viscid mass. In this way the filling proceeded until the contents of the heater were exhausted, and as the moulds were filled, fresh rows were arranged in front of the former; until at length a considerable portion of the extensive floor was occupied. Part of this busy scene is represented in the frontispiece.  

Matters remain in this condition until the next day, when the sugar has become partially solid: the moulds are then moved through the pull-up hole into an upper floor, which is maintained, by means of steam-pipes, at a temperature of 80°; the paper plus are removed, and a wire is passed through the hole to ensure an open channel; the moulds are then set in earthen jars, or are hung in a frame work over a gutter terminating in a sunken cistern. The syrup which flows off is of a greenish colour, and being collected and reboiled with raw sugar, it produces an inferior quality of lump sugar; this again furnishes a syrup, which supplies a yet lower description of sugar, and when all the crystalline particles have been removed, the residue is sold as treacle.  

In the course of two or three days the drainage is complete: but there still remains a portion of syrup and uncrystalline matter entangled with the solid sugar. To get rid of this, a process of washing is adopted, which, under the old method, was performed by claying, as already described; but now by a process, one of Mr. Howard’s valuable improvements, which accomplishes the work in one-fourth of the time formerly required. Some finely clarified syrup is made by dissolving warm water loaf sugar, consisting of the turnings obtained by a subsequent process and such loaves as do not satisfy the critical eye of the refiner, either by their shape or crystalline texture. The syrup thus obtained is poured to the depth of about an inch, upon the broad part of each cone, the surface of which has been previously broken up and made level by an iron tool called a bottoming trowel. As this syrup is concentrated, it can dissolve none of the sugar already crystallized but readily unites with molasses and colouring matter which do not crystallize, and gradually drains away with them. The loaf improves in whiteness, from the base to the point, every time this operation is performed. A few moulds are emptied from time to time to examine the success of the blanching; and when the loaves have acquired as much colour (as the whiteness is called by the refiners) as is judged necessary, and are sufficiently dry, they are netted, that is made net, or neat, in appearance.  



The moulds are taken one by one, and placed across a trough, and the base scraped with the bottoming-trowel, so as to produce an even surface: this operation is called brushing-off. A few blows being applied to the mould, the sugar is loosened, and turned out upon its base. If the sugar is of the best quality, it is of a perfectly pure white, from the base to within five or six inches of the point, and here a portion of moisture and colouring matter still remains, which is removed by the process of turning off. This is effected by cutting blades, arranged in a conical form, connected with wheel-work, to which motion is given by one man, while another gradually introduces the loaf within the space formed by the knives, whereby the coloured damp portion is removed, and the loaf improved in shape. Loaves of coarser sugar are not turned off, but the damp ends are cut off, leaving them in the form of a truncated cone. The loaves are then removed to an oven, which occupies nearly the whole height of the building, upon a base of not more than ten feet square. This oven is provided with open frames, from the base to the top, upon which the loaves are arranged, and a constant temperature of about 140° is maintained, by a numerous assemblage of steam pipes. When sufficiently dry, the loaves are taken out, tied up in paper, and are then fit for the grocer’s shop.  

The routine of operations at the refinery takes about a fortnight, during which various qualities of sugar are produced; first, white loaves of the finest quality, obtained directly from the raw or muscovado sugar; secondly, a second quality called lumps, composed of the second runnings, which are the syrup used in washing the loaves after the green syrup is separated; thirdly an inferior quality, composed of the green syrup, mixed with the raw sugar, producing what are called bastards. These are crushed into powder, and sold as a superior kind of moist sugar; fourthly, several inferior kinds of sugar are produced from the refuse matter, consisting of the impurities collected in the bag-filters, the scrapings of the various floors and the waste, which in the several departments of an extensive refinery is necessarily great. All these sources of sugar are carefully collected; the crystalline particles separated from the treacle, and this again from dirt, and other impurities, which are finally sold as manure. Every third week the routine is again commenced, and carried on during another fortnight of twelve days; for it is satisfactory to learn that, in this manufacture, Sunday is a day of rest.    

 

As some of the different qualifies of sugar are being forwarded a stage at the same point of time, the stranger is somewhat embarrassed to notice such various results produced, as it were, by the same means. But on clearly understanding the economy of the refinery, he will be able to trace the pure white loaves, from the raw sugar in the hogshead to its final completion, passing over, as accidental or subsidiary, the various arrangements whereby inferior loaves are produced, or in other words, whereby waste is prevented. In such a case the refinery presents points of the highest interest. It is curious to witness the application of so much science, ingenuity, skill, and capital; to the production of an article which, after all, is one of mere luxury, and according to Dr. Prout, is inferior in nutritive properties to the raw sugar which furnishes it, a circumstance which may afford some satisfaction to those persons whose means will not allow them to use white sugar. The working floors of the refinery, containing many thousand moulds filled with sugar, are peculiarly striking. The utmost care is taken to guard the sugar from speck or stain, but the floors themselves are not so privileged: during the processes of filling and washing, small quantities of syrup are being constantly spilt, and this is soon trampled into a thick viscid mud, which adheres to the feet, and in some places actually impedes motion. Heat is every where present, and often to an oppressive degree, but its source is seldom seen; the system of heating by steam has enabled the refiner to regulate the supply of heat as he may desire, and has also rendered perfectly safe a process which was formerly very hazardous. The effect of the various modern improvements has greatly reduced the price of refined sugar; at one time its price was 40 per cent greater than raw sugar, but now the difference in price is not more than 20 per cent.  

Statistics of Sugar

The consumption of sugar in different years is liable to great fluctuation, arising from variation in price, and the means of the people to purchase; but it has been calculated that the annual consumption averages about 20 lbs per head for Great Britain; about 5 lbs per head for France; 4lbs for Germany; and about 2½ lbs for other parts of Europe.   

In the year 1839, the quantity of cane sugar produced in different parts of the world was estimated as follows:  

   

   

Cwts  

The British Sugar Colonies  

Exported  

3,571,378  

British India  

Exported  

519,126  

Danish West Indies  

Exported  

450,000  

Dutch West Indies  

Exported  

260,000  

French Sugar Colonies  

Exported  

2,160,000  

United States of America  

Exported  

900,000  

Brazil  

Exported  

2,400,000  

Spanish West Indies  

Exported  

4,481,342  

Java  

Exported  

892,475  

Exported for internal consumption, exclusive of China, India, Siam, Java and the United States  

   

   

2,446,337  

   

18,080,718  

Between one-fourth and one-fifth of this quantity is consumed in the United Kingdom. The quantities imported during three years are as follows:  

   

1839  

Cwts  

1840  

Cwts  

1841  

Cwts  

West India, of British Possessions  

2,823,931  

2,202,833  

2,145,500  

East India, of British Possessions  

518,925  

482,824  

1,239,738  

East India, of Foreign Possessions  

722,777  

-  

803,668  

Mauritius  

612,009  

545,009  

716,112  

Foreign  

722,777  

805,179  

-  

The duty of sugar from British possessions was during many years 24s per cwt; foreign sugars paid a duty of 63s per cwt. The net revenue from this source, for 1839 was 4,586,936l.; for 1840, 4,449,033l; and for 1841 5,114,390l. By a recent act of the legislature the duties payable on the importation of sugar, subject to minor exceptions, depending on reciprocity treaties, and other circumstances, are as follows:  

Sugar grown in British West Indies or East India  

   

Per Cwt  

Double Refined  

£1. 1. 0  

Refined  

0.18.8  

Clayed  

0.16.4  

Brown or Muscovado  

0.14.0  

Molasses  

0.5.3  

Sugar grown in other British Colonies  

   

Clayed  

1.1.9  

Brown  

0.18.8  

Sugar grown by free labour in Foreign Countries  

Clayed  

1.8.0  

Brown  

1.3.4  

Sugar grown by slave labour in Foreign Countries  

Refined  

8.8.0  

Brown  

3.3.0  

Molasses  

1.3.9  

Before these alterations, refined sugar was not allowed to be made in any of our colonies, but was reserved for the advantage of this country: considerable quantities were, therefore, annually exported. In the year ending 25th June 1840, the chief export of British refined sugar was as follows:  

   

Cwts  

To Italy  

40,000  

To British North America  

37,000  

To Turkey  

30,000  

To Russia  

20,000  

To Australian Settlements  

11,000  

To British West Indies  

10,500  

Although foreign sugar paid nearly three times the duty charged on our colonial sugar, yet the refiner was permitted to refine it in bond for exportation, a drawback being allowed in the proportion of 34 cwt. of raw to 20 cwt. of refined.  

The men engaged in the sugar refinery appear to enjoy average good health. In some of the processes, they are exposed to a warm damp atmosphere and in others to hot dry air; but they are not long enough at them to suffer injuriously, the nature of the work leading them to conduct other processes which are rather healthy than otherwise. The preparation of the bone black is peculiarly disagreeable and dirty, the air of the room in which it is performed being very hot, and loaded with particles of dust; but this is usually a separate trade.  

 
The content of this page was produced by Ray Sarfas.

 

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