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PREFACE 5

Millions from Waste

WASTE: ITS RELATION TO COMMERCE AND NATIONAL ECONOMY

Extravagance is the inevitable corollary to cheap living. The expression "living" is used in its very broadest sense, and is by no means confined to the mere consumption of foodstuffs. If living be cheap the thousand and one attributes complementary thereto, from wearing apparel to creature comforts for the home and from raw materials to finished goods, must necessarily rule low in price. Under such conditions the very fact that it is cheaper, as well as easier and simpler, to incur a further capital charge, rather than to endeavour to induce additional service from what is already in hand, though possibly damaged slightly, prompts waste, in precisely the same way as it is more expedient to replace the damaged part of a standardized article, whether it be a motor-car, sewing machine, typewriter, or watch, than to attempt to carry out a repair.

It is also somewhat significant to record that improvidence is intimately associated with cheap labour. Cheap living and cheap labour go hand-in-hand. As a matter of fact, until recently the average working members of the community, from the comparative point of view, have been guilty of greater improvidence than those who are well-blessed with this world's goods.

This apparent anomaly is readily explicable. In the houses of the wealthy the accumulation of residues of every description must necessarily attain imposing dimensions. But these wastes are not lost to commerce and industry. In the majority of cases they are handed over to the employees by whom they are regarded as legitimate perquisites. To gratify some individual whim, passing fancy, or from inherent tendency to bargain, these residues are carefully garnered and harboured to be converted into cash through one or other of the many purchasing channels which appear to diverge to these centres. The cooks dispose of bones, fats, and greases, as well as other wastes from the kitchen, to the itinerant rag-and-bone merchant; rejected wearing apparel finds its way to the wardrobe dealer; worn-out copper, iron and aluminium culinary utensils, as well as divers other metallic odds and ends gravitate to the specialists in old iron and waste metals; superfluous produce from the kitchen garden meets with profitable distribution, while even the swill is able to command its market.

It is the opportunity to profit in pocket from such "extras" which acts as the incentive to collect, separate and to bargain for the sale of wastes from a pretentious house. But, as the social scale is descended, the tendency to keep a tight hand upon the refuse suffers unconscious relaxation. This is primarily due to the fact that the volume of such accumulations undergoes attenuation as the social ladder is descended. As the bulk diminishes so does the impression, "Oh! it is not worth while troubling about!" become accentuated. Finally, when we reach the bottom of the ladder--the average working household--the quantity of waste is considered to be so trifling as to be deemed quite unworthy of consideration. Consequently, here we find the whole, or at least 90 per cent., of the refuse consigned to the fire, or to the rubbish heap, instead of being preserved and turned into a profitable channel to receive a new lease of utility.

As with the home so with the office and factory. The small workshop or business establishment accommodated within one or two rooms records its proportion of waste, but it apparently is so slender as to be comparatively insignificant. Furthermore, as a rule, it is so varied as to aggravate the thought of being more nuisance than it is worth. Accordingly, the refuse is neither sorted nor retained, but, especially if it be combustible, meets with an untimely end. On the other hand, in the large factory, the accumulations being of distinct magnitude, segregation and careful retention are observed to facilitate ready sale, while arrangements are even completed for the periodical clearance of the refuse at mutually satisfactory if not prevailing market prices. Whether the waste ever commands its real intrinsic value is a matter of opinion, because we have never been persuaded to regard the residue disposal problem in the strict commercial sense.

Reflection gives rise to the question--What is waste? A more appropriate explanation than a paraphrase of Palmerston's famous dictum concerning dirt would be difficult to find. Waste is merely raw material in the wrong place. In the spirit fostered by our traditional improvidence we have sought to adapt another existing term to meet the situation. We glibly dismiss waste as rubbish. It is not, but because we have been too indolent to occupy our minds in the elaboration of further possible applications for what we do not actually require for conduct of the operations with which our individual exertions are identified, we seek to satisfy our consciences in the easiest manner. In so doing we essay to flout a fundamental law of Nature--the indestructibility of matter. We have failed to appreciate that what may be of no immediate value to ourselves may, indeed can, with judicious and scientific handling be persuaded to serve in the capacity of indispensable raw material to other ranges of endeavour. It may even go so far as to supply the wherewithal for the creation of new industries, widening the possible fields of employment, and contribute pronouncedly towards the wealth of the nation.

This fact can be brought home very conclusively. In the opening days of this century the amount of fats, oils, and greases which were allowed to run to waste was colossal. They were cheap commodities and, although they occur in greater or lesser degree with the majority of organic materials in popular request, not a thought was expended upon the possible losses which their discard with so-called wastes represented. But, during the past few years, the demand for these substances has advanced by leaps and bounds. They have become vital to the table in several forms, and this request has brought the food-producing industry into conflict with another trade of far-reaching importance, namely, the manufacture of soap. The situation is rather peculiar, as I point out in a subsequent chapter. Some idea of the volume of fats absorbed in the preparation of margarine and soap, respectively, may be gathered from the narration of the fact that one of the largest soap manufactories in the world demands the supply of fat in a steady stream of about 5,000 tons per week.

A few years ago the activities of this particular firm were concentrated upon the manufacture of soap. It was the solitary product. But it had its attention attracted to the growth and possibilities of the margarine trade, and it decided to enter this market. To-day, its activities are divided between the production of the two commodities, and, curiously enough, almost equally. From its works issue out about 6,000 tons of soap and 4,000 tons of margarine every week.

This merely represents the endeavours of one firm. There are scores of others following a similar line of action. The result is that the demand for fats has reached an unprecedented level. At the moment of writing the coarsest grade of fat is able to command approximately ?50--0--a ton. Is it surprising therefore that every effort should now be made to extract the fats, grease, and oil associated with every form of organic waste, and that keen effort should be made to secure increasing quantities of waste capable of yielding this material?

So far as the public is concerned this spirited search for fat may be regarded with misgiving, if not absolute alarm. The wizardry of the chemist is acknowledged, and the thought possibly prevails that much of the fat now being turned into margarine is really only fitted for the production of soap. But alarmist or pessimistic feelings in this direction may be speedily allayed, though it is permissible to point out that ten years ago much fat was turned into the cleanser which should have been utilized as a foodstuff, inasmuch as its freshness and wholesomeness were above all criticism. It was merely turned over to the soap-maker because no alternative application was apparent. But conceding the magical qualifications of the chemist, there are some feats which yet remain beyond his powers. The ability to turn bad fat into good for dietetic purposes must be numbered among those achievements which as yet have proved impracticable. If a fat be rancid it cannot possibly be reconditioned for edible purposes. No matter how its preparation may be coaxed and nursed it cannot be converted into a foodstuff. The palate would detect rancidity instantly. Consequently, only the highest grades of animal fat are used for the preparation of margarine; the fact that the big-scale production of a food should have been embraced by the soap-maker merely represents one of those inexplicable coincidences of industry.

It is distinctly interesting, if not actually amusing, to follow what may be described as the utilitarian conjugation of waste. It remains an incubus, if not an unmitigated nuisance, until the chemist, or some other keenly observant individual possessed of a fertile mind, comes along to rake it over and to indulge in experiments. Such efforts are often followed with ill-concealed amusement. A few years since they were even regarded as so much waste of time. In due course some definite conclusion is reached, and the fact becomes driven home that, if such-and-such a process be followed a particular spurned refuse can be utilized as raw material for the production of some specific article. Then scepticism and amusement give way to intense interest and speculative rumination. The new idea is submitted to the stern test of practical application upon a commercial basis, while the financial end of the proposal, which is the determining factor, is carefully weighed.

These complex issues being satisfactorily settled the exploitation of the erstwhile waste, or rubbish, is energetically pursued. It has now become a potentially valuable by-product, and, accordingly, must be worked for all it is worth. Firmly entrenched upon the market development is vigorously pursued, often to culminate in the quondam waste, now an established by-product, being lifted to such a position of commercial eminence as to dispute premier recognition with the staple in the production of which it is incurred. In more than one instance the by-product has even eclipsed the primary product, or at least attained a level of equal importance, while occasionally the staple has even suffered virtual deposition to rank as little else but a by-product. There are even some cases on record where the manufacture of the staple has been abandoned, at all events for a time, because the by-product, the former incubus of the industry has become invested with such far-reaching importance as to demand the concentration of effort upon its production. Waste--by-product--staple: such constitutes the brief evolution of more than one of the world's leading lines of trading.

What is the position to-day. Gas, the staple product from the distillation of coal three-quarters of a century ago, now, to all intents and purposes, is the by-product. The world could roll along very comfortably without it. Indeed, we may have to do so in the near future when the gas is stripped of every other marketable constituent, leaving only a mixture of methane and hydrogen gases to be burned under boilers to raise steam for the generation of electricity in enormous bulk. The ammonia which formerly jeopardized health and lives, and to remove and to throw away which the pioneer engineers strained every nerve, is now trapped to be converted into fertilizer. Then the tar which likewise nearly drove the engineers frantic is now carefully drawn off, collected and resolved into a host of wonderful articles to furnish a diversity of indispensable materials. It would be wearisome to recite the list. It is so lengthy. But it would seem as if the by-products of coal touch every other industry, ranging from dyes to chemicals, flavourings to disinfectants, perfumes to therapeutics and soporifics.

As with coal so with oil. Forty years ago the boring of a well was followed with mixed feelings by the indefatigable driller. A "strike," while devoutly to be desired, was just as likely to bring dreadful disaster swift and sudden, even death, as wealth untold. The driller probed the earth animated by one idea. This was to tap the subterranean lake of crude petroleum. But in driving his bore the driller invariably crashed through the roof of an underground reservoir of petroleum gas. Ignorant of the value of this product, though painfully aware of its danger if allowed to break away and to get beyond control, the early seekers for oil led this gas through a pipe to a point some distance away. There the flow from the open end was ignited and the gas allowed to burn merrily in the open air. The driller knew no peace of mind until the flame flickered and expired as a result of the exhaustion of the subterranean gasometer. Then, and not until, he could resume his boring for the precious liquid with complacency.

But with passing years and progress came enlightenment. The gas is no longer wasted; it is trapped. In some instances it is led through piping for hundreds of miles to feed hungry furnaces engaged in the making of steel and other products. The earth is even being drilled, not for petroleum, but for its huge supplies of natural gas, and the huge reservoirs thus discovered are being harnessed to the thousand wheels of industry. We even find trains fitted with cylinders carrying natural gas stored under high pressure to furnish light for the convenience of passengers, and to enable dainty meals to be cooked in the kitchens of the dining-cars.

The oil refineries, upon receiving the crude petroleum, set out to recover as much paraffin as they could. This was the primary product, because a brilliant British chemist, Young, had discovered how to distil paraffin from petroleum for lighting, heating, and cooking. It represented a huge advance upon the lamp dependent upon whale oil and the tallow dip. But before the refiners could reach the paraffin they were called upon to wrestle with a lighter spirit which sorely harassed and perplexed them. It was extremely volatile, and highly inflammable--even explosive in the vapour form when mixed with air--and accordingly was construed into a menace to the refinery. It was carefully drawn off and dumped into large pits, where it was burned merely to get rid of it. Its commercial value was set down as nil. A certain quantity was used by laundries and dry-cleaners because of its striking cleansing qualities, but it was used sparingly and cautiously owing to its dangerous character. It could be purchased only with difficulty, and in small quantities by the members of the public, the retailers for the most part being chemists and druggists. If one were glib of tongue and a master of the persuasive art, one might succeed in obtaining as much as half-a-pint in a single purchase.

Suddenly a creative mind evolved the high-speed internal combustion engine, which heralded the coming of the motor-car, the submarine, and more recently the aeroplane and airship. The volatile spirit which hitherto had been spurned and burned wastefully by the refineries was immediately discovered to be invested with a value which had heretofore escaped attention. It formed the ideal fuel for the new motor. Forthwith wanton destruction of the volatile spirit was abandoned. Every drop was carefully collected, and, as time went on and the demand for the light liquid fuel increased, the refiners put forth greater effort to wring every possible dram of petrol from the crude petroleum. Paraffin, which had hitherto been regarded as the staple, was ignored. It even dropped in commercial estimation as a by-product and became a drug on the market, although, fortunately, the refineries hesitated from repeating the practice they had honoured in regard to petrol--summary destruction by fire.

So insistent and overwhelming has grown the demand for petrol that the producers are hard put to it to keep pace with the requirements. A petroleum boom has reverberated around the world, eclipsing in intensity any stampede identified with the search for gold. To these islands the petroleum age has contributed very little wealth, although it has been responsible for revived interest in the exploitation of our shale--another form of waste--but to Russia, the United States of America, Mexico, and the East, where the earth reeks with petroleum, it has brought wealth untold. It has completely transformed the economic outlook of certain nations, and in some instances has served to rescue a country from bankruptcy. To us it is of appreciable significance because, so far, we have been compelled to draw upon distant sources for our requirements and so have to contribute to the national wealth of others, some of whom are our most spirited rivals in trade.

In 1913 our imports of petroleum products aggregated 488,106,963 gallons, valued at ?10,856,806--,284,030--the contribution from Greater Britain being 22,172,701 gallons, valued at ?829,868--,149,340. Of this enormous volume 100,858,017 gallons represented petrol for our motors--the waste product of forty years ago at the refineries--for which we had to pay ?3,803,397--,016,985. In the year when mechanical road propulsion was ushered in petrol could be obtained for about 4d.--8 cents--a gallon: in 1918 it commanded 3s. 6d.--84 cents--a gallon. An increase of over 900 per cent. in value within approximately 35 years represents no mean achievement in commercial expansion, but when it relates to an erstwhile waste product the record is far more sensational.

To relate all the fortunes which have been amassed from the commercialization of what was once rejected and valueless would require a volume. Yet it is a story of fascinating romance and one difficult to parallel in the whole realm of human activity. It was the waste energy of water which laid the foundations of Lord Armstrong's fortune and the enormous fabric of the huge firm on Tyneside. Sir Hiram Maxim revolutionized warfare by harnessing the wasted kick or recoil to reload and fire his machine-gun, thereby introducing one of the most formidable small arms ever devised to conduct the gentle art of killing. Lord Masham established a new industry and became a millionaire by taking the "chassum" or silk waste--a refuse which had even suffered rejection as a manure because it took such a long time to rot--and utilizing it as a raw material for the production of a new and wonderful range of beautiful fabrics in velvet and plush. It was another textile wizard, Sir Titus Salt, who perfected the process for turning the wool sheared from the back of a member of the camel family roaming the heights of the Andes, and which was classed as sheer rubbish, into the soft glossy fabric known as alpaca.

But one of the most powerful expressions of the possibilities attending the scientific utilization of waste, and one which brings home very forcibly to us the national wealth to be won from refuse, is associated with our woollen industry. Where would Yorkshire be without mungo or shoddy? Dewsbury has become the world's centre for the disposal of old clothes and woollen rags. Here converge all the streams bearing abandoned flotsam and jetsam into the preparation of which wool has entered. There is scarcely anything more disreputable, if not actually repellent, than a sack of woollen rags. But pass that waste through suitable machines and a wonderful transformation in attractiveness, colouring, and design, as well as texture, is accomplished.

Wool can never be worn out. That is an indisputable axiom in woollen circles. It does not matter how many years ago the textile may first have been prepared, nor the many and varied vicissitudes through which it may have passed; it can be used over and over again. It may have travelled through the machines forty or fifty times, may have graced the form of a hundred persons, may have clothed a scarecrow or have been retrieved from a river in the course of its career. True, with each new lease of life it suffers a certain depreciation, but blended with new wool or cotton it is effectively revived. The history of a fibre of wool would be distinctly romantic and thrilling could it be but written, and even the wildest flights of imagination would be unable to rival stern fact. It is the ability to work and re-work up woollen textile for an indefinite period which has contributed to the prosperity of Yorkshire, and which has enabled this country to build up an export trade in this commodity exceeding ?500,000,000--,500,000,000--a year in value.

An impressively successful, yet sinister, utilization of waste was brought to light during the war. In their methodical investigation of the dye-stuffs problem the Germans found it necessary to prepare a certain substance which constitutes the starting-point for the production of one of their leading products. Toluol, a by-product from the manufacture of gas, is taken and treated with nitric acid. Now orthonitrotoluol is the specific product in request, but nitrification produces two substances, orthonitrotoluol and paranitrotoluol, respectively. The last-named is of no use whatever, but its production has to be suffered, though, unfortunately, the yield thereof is twice that of the essential article. So far as the industrial pursuit in question is concerned the paranitrotoluol represented a sheer waste.

Now the German, when he encounters a waste, does not throw it away or allow it to remain an incubus. Saturated with the principle that the residue from one process merely represents so much raw material for another line of endeavour, he at once sets to work to attempt to discover some use for a refuse. Manufacturers in other countries were equally troubled with the accumulations of paranitrotoluol because the production of the two substances as a result of nitrifying toluol is strictly in accordance with constitutional chemical law. They also learned that the Germans had succeeded in turning it to advantage. What was this application? This was the poser. They sought enlightenment in this direction but found that the German was resolutely keeping his discovery to himself.

Other countries remained in ignorance until the Germans set out to materialize their fantastic dream of world-wide domination. When their hordes burst upon the frontier defences of Belgium, and their bombardment played sad havoc with the fortifications of Liege and Namur, the world marvelled. The intense destructive power of the high explosive which was being used was something new to warfare. It was promptly investigated, and then the use for the paranitrotoluol, the apparent incubus of the dye-stuffs-producing factories, was discovered. It was being turned into the destructive agent familiarly known as T.N.T., or trinitrotoluol, to give the explosive its true chemical designation.

It is perfectly obvious, from what has been related, that, if one will only devote sufficient energy and fertility of thought to the study of so-called rubbish and its properties, incalculable economic and financial benefits must redound to the individual. And as with individuals so with nations. The British race is generally assailed as being woefully improvident and remiss in the profitable exploitation of waste, but it errs in excellent company. The United States of America are probably far more guilty in this respect. According to the statement of the American Food Administrator the inhabitants of 24 cities between the Atlantic and Pacific Oceans, by ignoring the latent wealth contained in their garbage barrels, are throwing away sufficient grease and fat during the year to produce 30,000,000 one-pound bars of soap. On the other hand, 300 small towns, by pursuing thrift in this direction, are producing sufficient food from the disposal of their swill to yield 50,000,000 additional pounds of pork worth ?1,600,000 a year, although in this instance the results might be doubled by the practice of more perfect methods. Another 350 towns, which disdain the value of their swill-tubs, are throwing away approximately ?2,000,000 a year because they are not inclined to take a little trouble concerning the disposal of their garbage.

The diligent exploitation of waste exercises a far-reaching influence upon the wealth of nations. If we were to turn the whole of our residues, both industrial and domestic, to the utmost account we should be able to cut down our annual expenditure upon purchases from abroad to a very startling degree. Every ton of import saved not only represents the retention of so much sterling in our pocket, but releases a ton of shipping for the movement of other material, not necessarily to these islands, but between other countries, since it must not be forgotten that we derive an appreciable proportion of our national income from carrying the trade of the world. If we were to salvage all the rags entering into the domestic refuse of the nation we could reduce our imports of wool during the year by 19,000 tons, and allow 15,000 tons of shipping space to be devoted to other purposes. From the yield of cotton refuse derived from the dust-bins we could turn out 16,000 tons of new paper. If we were to become miserly in our collection of waste-paper and to turn it back into the mills, we could secure a further 44,000 tons of new paper during the year and save the import of 75,000 tons of wet pulp from Scandinavia. Were all our old tins handed over to the steel-makers we could reproduce from this raw material 74,000 tons of new steel and dispense with 148,000 tons of Spanish ore. The steel obtainable from the re-smelting of old tins alone would furnish sufficient material to construct approximately forty 3,000-ton vessels.

Fortunately, a change in the national habits of extravagance is to be recorded. The increased cost of living is compelling more sparing use of the necessaries of life and industry. The incontrovertible truth of the axiom "Waste not; want not," although it may sound rather trite, has been brought home to us. But the complete salvage of waste is probably impossible of realization so long as the kitchen stove and furnace remain. Fire is an excellent destructive agency, but is far too handy for the removal from sight, if not from memory, of the multitude of odds and ends incidental to our complex social and industrial existence. With the coming of the electric age, and the supersession of kitchen stoves and factory furnaces by cheap current, the facilities for the ready destruction of what is really valuable raw material under the guise of waste will be removed. In the interests of economy and wealth, both individual and national, it is to be hoped that the coming of the electric era may not be unduly delayed.

THE GERMAN CONQUEST OF WASTE

Waste creates wealth. If one desire a convincing illustration of the truth of this latter-day precept one has only to cross the North Sea. It is generally conceded that, at the dawn of the second decade of the twentieth century, the Teutonic Empire had the world at its feet so far as commerce is concerned. There is little reason to doubt but that Germany would have become the super-trading nation of the world within a few more years had not territorial ambition and the lust for military conquest have blinded Reason.

The pre-war wealth of the country, that is as it stood in 1914, is universally acknowledged. But what is not so generally appreciated is the circumstance that, to a very marked degree, this wealth was secured as a result of the scientific utilization of waste. In every ramification of industrial and social activity thrift, system, and organization were conspicuous. Circumstances were primarily responsible for the pursuance of such a policy. Germany is essentially an agricultural country. She was dependent upon outside sources of supply for many of the staple raw materials wherewith to keep her mills and factories going. Consequently she was compelled to rely for her existence upon the margin between buying and selling, and she naturally strove to render this difference as pronounced as possible by turning her purchases to the maximum advantage. Even in the exploitation of her natural resources this tendency was manifest, but little wastage being suffered.

The Germans went farther. From the experience amassed in the development of wealth from waste products they were quite prepared to buy residues from foreign competitors, to ship them to the Homeland, and there to work them up. The country was quite prepared to act as a marine store upon a big scale, because thereby it was able to acquire valuable potential raw materials for infinitesimal expense. The vending countries, as a rule, were quite ready to dispose of their waste at a trifling figure, and often more unfeignedly glad to be rid of what they considered to be a nuisance, comforting themselves with the thought that they had been able to drive good bargains from the sale of what was useless to themselves.

The Teuton buyers were equally satisfied. They generally succeeded in buying useful material at an absurdly low figure. Very often the heaviest item of expense in such transactions was the cost of freighting the waste to Germany, but here they were able to reap distinct advantages from preferential rates. However, such expenditure was speedily recouped because the articles contrived from the erstwhile rubbish commanded a ready sale and at attractive prices. It was by no means uncommon for the Germans to sell the commercial products wrought from the waste back to the very firms whence the last-named had been acquired, and at a considerably enhanced figure.

The strangest feature about these transactions was the keenness with which they were conducted. The countries concerned were far readier to resort to such commercial tactics than to bestir themselves to turn their wastes to similar account, although it must be admitted that the wily Teutons, recognizing the advantage they held, were disposed to invest their processes for translating refuse into commodities with distinct secrecy. They played a gigantic game of bluff and their temerity met with success. If the victims had only reflected they would have realized that such activity was quite possible to themselves; that such enterprise would have provided additional avenues for the employment of their own citizens, and would have contributed materially to their individual commercial wealth.

The Germans ransacked the world for wastes. For instance, who but the Teuton would have gone to stone-fruit packers on the other side of the world and have offered to purchase the stones which the preservers discarded and burned under the factory boilers to assist in raising steam? But the purchasing German firm was astute. The stones were sent home and the packers laughed at the idea of moving such refuse half-way round the world. The buyers suffered the taunts in silence. Upon reaching the German factories the fruit-stones were cracked and the nuts extracted. These were submitted to treatment to yield a wide range of oils, some of which were turned into essences and liqueurs. Then the Germans dispatched much of this reclaimed produce back to the territory where the stones were purchased, where it was bought with avidity, and at inordinately high prices. Little did the packers think that they were buying back their own refuse in another and useful form and were being compelled to pay heavily for the privilege!

The fibrous residue, remaining after the expression of the oil, was turned into cattle-food, much of which also was sold in foreign markets. The nut-shells were turned into carbon or charcoal, which, from its peculiar quality and high grade, was eminently adapted to laboratory and other uses. We were forced to realize that such shells possess distinct virtues, for did we not encourage one and all to save the stones from fruit to furnish the requisite absorbent material with which to equip the gas-masks served to our soldiers to combat the evils of the poison-gas used in the war! In this connection we were completely forestalled by the enemy. Undoubtedly he was encouraged to launch such a devilish weapon from his discovery of a complete antidote to such aggressive measures in the charcoal made from the spurned nut-shells accruing to the fruit-packing country on the other side of the globe.

Sawdust accumulates in Germany as it does in every country where working in wood is practised extensively. But there the waste is not turned into rivers or burned in destructors as in the United States and Canada. Nor is it dumped in unsightly heaps to rot slowly, used to bed-down stock, or distributed over the floors of butchers' shops and public-houses as in these islands.

A firm conceived the idea of turning this residue to account in the fabrication of a special form of plastic floor-covering. It was mixed with magnesium chloride to form a cement to be applied somewhat after the manner of asphalt, the whole of the area thus being covered and finished off with suitable tools to yield a smooth, level, and attractive finish.

However, it was speedily discovered that this floor-covering suffered from one disability. Magnesium chloride is hygroscopic: it absorbs water, even moisture from the atmosphere, very readily. Consequently it became soft and damp in humid and wet weather. Otherwise it left nothing to be desired, being comfortable to the tread, silent, and warm.

The German is nothing if not thorough. He does not hesitate to harness science to the wheels of industry when the occasion so demands. He realized that to utilize sawdust as a floor-covering it would be necessary to follow strict scientific lines. Accordingly the chemist was called in. He, as a result of prolonged investigations and numerous tests, succeeded in overcoming the outstanding inherent defect of the sawdust paving, and at the same time emphasized that control of the proportions of sawdust and magnesium chloride was essential owing to the first-named varying so widely in its characteristics according to the nature of the wood from which it is derived. Consequently the manufacture of this floor-covering is now supervised by the chemist, and the hygroscopic difficulty has been effectively overcome. The material has achieved a distinct vogue, not only in Germany, but in other countries. It is extremely effective and is relatively inexpensive--the cost averages from 5 to 7 shillings per square yard--bearing in mind its durable and wearing qualities. Incidentally the country has found a highly profitable outlet for its accumulations of sawdust.

The world's consumption of tin-plate has risen to enormous proportions, the extraordinary expansion of the tinned or canned food industry being responsible for this development. Thousands of tons of steel are absorbed in the manufacture of these containers, as well as hundreds of tons of tin and solder. Upon the removal of the contents the tins are generally thrown away, especially by the prodigal nations. This wastage became so flagrant as to arouse the severe condemnation of economists in every country, but these would-be apostles found it well-nigh hopeless to persuade their compatriots to endeavour to exploit the empty tins. Here and there spasmodic efforts were made upon a limited scale to recover the solder, tin, and steel-plate for further use, but the problem did not prove so easy of solution as it had appeared.

The bulk of the vessel constituted a formidable obstacle, while its susceptibility to the ravages of rust was also discovered to be a distinct drawback. In this country the general practice has beep to crush the tins flat and to feed them into the blast furnaces as scrap, but in this process the tin vanishes up the chimney, while the solder is also lost, though the steel-plate, which forms 99 per cent. of the composition of the vessel, becomes available as raw material. Nevertheless, although the quantity of tin used is trifling, representing only approximately one per cent., the Germans considered it to be quite worthy of recovery, especially when tin commanded from ?150 to ?200--0 to ,000--per ton.

The Teuton attacked the tin-recovery problem more energetically than his colleagues in other countries and apparently achieved success, although the degree of triumph recorded in this connection has always remained a matter for considerable speculation. Be that as it may the German interests concerned were quite prepared to purchase empty British tins and to ship them across the North Sea to be treated in their home plants. From this fact it is only logical to assume that they had found practical ways and means to consummate the desired end, otherwise they would scarcely have gone to the lengths of organizing a complete collecting system in these islands, and of incurring the freightage charges, although the waste was carried at a low figure. With the outbreak of war, and the rise in the price of tin to approximately ?300 a ton, we were forced to inquire into the possibilities of recovering the tin and solder from this refuse, and by energetic action were able to equal, if not to surpass, German effort, so that to-day de-tinning may be said to represent an established British industry.

The fact that Germany was compelled to depend extensively upon outside sources for supplies of raw materials prompted the theory in many quarters that, once the British blockade was firmly established, surrender must follow quickly from economic pressure. But the enemy displayed his ability to hold out for a far longer period than we had anticipated. Why? Simply because the moment he saw himself isolated from his outside sources of supply he inaugurated a more rigid system for the compulsory collection, segregation and utilization of his domestic waste. We know to-day how sternly these orders were enforced, and how completely the country was covered by official organizations established to this end.

To ensure that nothing of industrial value should be lost a collecting centre was established in every village and hamlet, the local chief magistrate being vested with wide powers for the conduct of the work placed in his charge. It was his duty to see that everything and anything capable of further exploitation was retrieved. The inhabitants were notified by public placard that they must bring and surrender their accumulations of refuse to the collecting centre at specific intervals, according to the available machinery and the population of the village. The head of every family or household was held personally responsible for the preservation of anything capable of further use and residue incurred within his home. Any dereliction in this respect, or infraction of the official commands, was subject to punishment according to the nature of the offence.

The materials which were in greatest demand were duly set forth. They included such junk as old metal of every description, from useless cooking utensils to fragments of wire, worn-out tools, abandoned implements and nails recovered from packing cases: textile odds and ends no matter how old and threadbare from the heterogeneous contents of the rag-bag to discarded suits, dresses, hosiery, frills, ribbon, and hats: and kitchen waste in infinite variety. The metal was turned over to the munition plants, the textile waste to the woollen, paper, and other mills, while the organic waste was distributed throughout the countryside for feeding stock after the fats and greases had been extracted.

In the towns and cities similar organizations were created, only in these instances the regulations were somewhat more stringent. All and every kind of kitchen waste had to be surrendered daily. In the leading cities it was incumbent upon every householder to have his accumulation of refuse from the previous day ready for the arrival of the official collecting cart. As this passed through the street in which he resided he had to carry and discharge his consignment of refuse into the vehicle. In some instances, as in Berlin, this task involved early rising because the collecting duty had to be completed before 7 a.m.

In the towns and cities the waste was most rigorously controlled. It was criminal for the housewife or maid to permit the grease clinging to the plates and dishes from the table to escape down the sink. This fat had to be emptied into a special pail, and with the minimum of water. Terse instructions as to how this could be done to the satisfaction of the authorities were issued. It would seem as if the salvage of grease were carried to an absurdly fine degree, but in view of the prevailing circumstances the authorities were justified in compelling the recovery of such an apparently insignificant trifle as a dab or two of grease upon a dinner-plate, since it was found that the daily yield of fat from the average town was about 8,000 pounds. Truly the enemy may be said to have fully realized the truth that "many a mickle makes a muckle."

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