The first trials of the process were made at the blast-furnaces of Clyde and Calder; from whence the use of the hot blast gradually extended to the other iron-mining districts. In the course of a few years every furnace in Scotland, with one exception (that at Carron), had adopted the improvement; while it was also employed in half the furnaces of England and Wales, and in many of the furnaces on the Continent and in America. In course of time, and with increasing experience, various improvements were introduced in the process, more particularly in the shape of the air-heating vessels; the last form adopted being that of a congeries of tubes, similar to the tubular arrangement in the boiler of the locomotive, by which the greatest extent of heating surface was provided for the thorough heating of the air. By these modifications the temperature of the air introduced into the furnace has been raised from 240 degrees to 600 degrees, or the temperature of melting lead. To protect the nozzle of the air-pipe as it entered the furnace against the action of the intense heat to which it was subjected, a spiral pipe for a stream of cold water constantly to play in has been introduced within the sides of the iron tuyere through which the nozzle pa.s.ses; by which means the tuyere is kept comparatively cool, while the nozzle of the air-pipe is effectually protected.[4]

This valuable invention did not escape the usual fate of successful patents, and it was on several occasions the subject of protracted litigation. The first action occurred in 1832; but the objectors shortly gave in, and renewed their licence. In 1839, when the process had become generally adopted throughout Scotland, and, indeed, was found absolutely essential for smelting the peculiar ores of that country--more especially Mushet's Black Band--a powerful combination was formed amongst the ironmasters to resist the patent. The litigation which ensued extended over five years, during which period some twenty actions were proceeding in Scotland, and several in England. Three juries sat upon the subject at different times, and on three occasions appeals were carried to the House of Lords. One jury trial occupied ten days, during which a hundred and two witnesses were examined; the law costs on both sides amounting, it is supposed, to at least 40,000L. The result was, that the novelty and merit of Mr.

Neilson's invention were finally established, and he was secured in the enjoyment of the patent right.

We are gratified to add, that, though Mr. Neilson had to part with two-thirds of the profits of the invention to secure the capital and influence necessary to bring it into general use, he realized sufficient to enable him to enjoy the evening of his life in peace and comfort. He retired from active business to an estate which he purchased in 1851 in the Stewartry of Kirkcudbright, where he is found ready to lend a hand in every good work--whether in agricultural improvement, railway extension, or the moral and social good of those about him. Mindful of the success of his Workmen's Inst.i.tution at the Glasgow Gas-Works, he has, almost at his own door, erected a similar Inst.i.tution for the use of the parish in which his property is situated, the beneficial effects of which have been very marked in the district. We may add that Mr. Neilson's merits have been recognised by many eminent bodies--by the Inst.i.tution of Civil Engineers, the Chemical Society, and others--the last honour conferred on him being his election as a Member of the Royal Society in 1846.

The invention of the hot blast, in conjunction with the discovery of the Black Band ironstone, has had an extra ordinary effect upon the development of the iron-manufacture of Scotland. The coals of that country are generally unfit for c.o.king, and lose as much as 55 per cent. in the process. But by using the hot blast, the coal could be sent to the blast-furnace in its raw state, by which a large saving of fuel was effected.[5] Even coals of an inferior quality were by its means made available for the manufacture of iron. But one of the peculiar qualities of the Black Band ironstone is that in many cases it contains sufficient coaly matter for purposes of calcination, without any admixture of coal whatever. Before its discovery, all the iron manufactured in Scotland was made from clay-band; but the use of the latter has in a great measure been discontinued wherever a sufficient supply of Black Band can be obtained. And it is found to exist very extensively in most of the midland Scotch counties,--the coal and iron measures stretching in a broad belt from the Firth of Forth to the Irish Channel at the Firth of Clyde. At the time when the hot blast was invented, the fortunes of many of the older works were at a low ebb, and several of them had been discontinued; but they were speedily brought to life again wherever Black Band could be found. In 1829, the year after Neilson's patent was taken out, the total make of Scotland was 29,000 tons. As fresh discoveries of the mineral were made, in Ayrshire and Lanarkshire, new works were erected, until, in 1845, we find the production of Scotch pig-iron had increased to 475,000 tons.

It has since increased to upwards of a million of tons, nineteen-twentieths of which are made from Black Band ironstone.[6]

Employment has thus been given to vast numbers of our industrial population, and the wealth and resources of the Scotch iron districts have been increased to an extraordinary extent. During the last year there were 125 furnaces in blast throughout Scotland, each employing about 400 men in making an average of 200 tons a week; and the money distributed amongst the workmen may readily be computed from the fact that, under the most favourable circ.u.mstances, the cost of making iron in wages alone amounts to 36s. a-ton.[7]

An immense additional value was given to all land in which the Black Band was found. Mr. Mushet mentions that in 1839 the proprietor of the Airdrie estate derived a royalty of 16,500L. from the mineral, which had not before its discovery yielded him one farthing. At the same time, many fortunes have been made by pushing and energetic men who have of late years entered upon this new branch of industry. Amongst these may be mentioned the Bairds of Gartsherrie, who vie with the Guests and Crawshays of South Wales, and have advanced themselves in the course of a very few years from the station of small farmers to that of great capitalists owning estates in many counties, holding the highest character commercial men, and ranking among the largest employers of labour in the kingdom.

[1] Article by Dugald Bannatyne in Glasgow Mechanic's Magazine, No. 53, Dec. 1824.

[2] Glasgow Mechanic's Magazine, vol. iii. p. 159.

[3] Mr. Mushet described it as "a wonderful discovery," and one of the "most novel and beautiful improvements in his time." Professor Gregory of Aberdeen characterized it as "the greatest improvement with which he was acquainted." Mr. Jessop, an extensive English iron manufacturer, declared it to be "of as great advantage in the iron trade as Arkwright's machinery was in the cotton-spinning trade"; and Mr.

Fairbairn, in his contribution on "Iron" in the Encyclopaedia Britannica, says that it "has effected an entire revolution in the iron industry of Great Britain, and forms the last era in the history of this material."

[4] The invention of the tubular air-vessels and the water-tuyere belongs, we believe, to Mr. John Condie, sometime manager of the Blair Iron Works.

[5] Mr. Mushet says, "The greatest produce in iron per furnace with the Black Band and cold blast never exceeded 60 tons a-week. The produce per furnace now averages 90 tons a-week. Ten tons of this I attribute to the use of raw pit-coal, and the other twenty tons to the use of hot blast." [Papers on Iron and Steel, 127.] The produce per furnace is now 200 tons a-week and upwards. The hot blast process was afterwards applied to the making of iron with the anthracite or stone coal of Wales; for which a patent was taken out by George Crane in 1836.

Before the hot blast was introduced, anthracite coal would not act as fuel in the blast-furnace. When put in, it merely had the effect of putting the fire out. With the aid of the hot blast, however, it now proves to be a most valuable fuel in smelting.

[6] It is stated in the North British Review for Nov. 1845, that "As in Scotland every furnace--with the exception of one at Carron--now uses the hot blast the saving on our present produce of 400,000 tons of pig-iron is 2,000,000 tons of coals, 200,000 tons of limestone, and #650,000 sterling per annum." But as the Scotch produce is now above a million tons of pig-iron a year, the above figures will have to be multiplied by 2 1/2 to give the present annual savings.

[7] Papers read by Mr. Ralph Moore, Mining Engineer, Glasgow, before the Royal Scottish Society of Arts, Edin. 1861, pp. 13, 14.

CHAPTER X.

MECHANICAL INVENTIONS AND INVENTORS.

"L'invention nest-elle pas la poesie de la science? . . . Toutes les grandes decouvertes portent avec elles la trace ineffacable d'une pensee poetique. Il faut etre poete pour creer. Aussi, sommes-nous convaincus que si les puissantes machines, veritable source de la production et de l'industrie de nos jours, doivent recevoir des modifications radicales, ce sera a des hommes d'imagination, et non point a dea hommes purement speciaux, que l'on devra cette transformation."--E. M. BATAILLE, Traite des Machines a Vapeur.

Tools have played a highly important part in the history of civilization. Without tools and the ability to use them, man were indeed but a "poor, bare, forked animal,"--worse clothed than the birds, worse housed than the beaver, worse fed than the jackal. "Weak in himself," says Carlyle, "and of small stature, he stands on a basis, at most for the flattest-soled, of some half square foot, insecurely enough; has to straddle out his legs, Jest the very wind supplant him.

Feeblest of bipeds! Three quintals are a crushing load for him; the steer of the meadow tosses him aloft like a waste rag. Nevertheless he can use tools, can devise tools: with these the granite mountain melts into light dust before him; he kneads glowing iron as if it were soft paste; seas are his smooth highway, winds and fire his unvarying steeds. Nowhere do you find him without tools: without tools he is nothing; with tools he is all." His very first contrivances to support life were tools of the simplest and rudest construction; and his latest achievements in the subst.i.tution of machinery for the relief of the human hand and intellect are founded on the use of tools of a still higher order. Hence it is not without good reason that man has by some philosophers been defined as A TOOL-MAKING ANIMAL.

Tools, like everything else, had small beginnings. With the primitive stone-hammer and chisel very little could be done. The felling of a tree would occupy a workman a month, unless helped by the destructive action of fire. Dwellings could not be built, the soil could not be tilled, clothes could not be fashioned and made, and the hewing out of a boat was so tedious a process that the wood must have been far gone in decay before it could be launched. It was a great step in advance to discover the art of working in metals, more especially in steel, one of the few metals capable of taking a sharp edge and keeping it. From the date of this discovery, working in wood and stone would be found comparatively easy; and the results must speedily have been felt not only in the improvement of man's daily food, but in his domestic and social condition. Clothing could then be made, the primitive forest could be cleared and tillage carried on; abundant fuel could be obtained, dwellings erected, ships built, temples reared; every improvement in tools marking a new step in the development of the human intellect, and a further stage in the progress of human civilization.

The earliest tools were of the simplest possible character, consisting princ.i.p.ally of modifications of the wedge; such as the knife, the shears (formed of two knives working on a joint), the chisel, and the axe. These, with the primitive hammer, formed the princ.i.p.al stock-in-trade of the early mechanics, who were handicraftsmen in the literal sense of the word. But the work which the early craftsmen in wood, stone, bra.s.s, and iron, contrived to execute, sufficed to show how much expertness in the handling of tools will serve to compensate for their mechanical imperfections. Workmen then sought rather to aid muscular strength than to supersede it, and mainly to facilitate the efforts of manual skill. Another tool became added to those mentioned above, which proved an additional source of power to the workman. We mean the Saw, which was considered of so much importance that its inventor was honoured with a place among the G.o.ds in the mythology of the Greeks. This invention is said to have been suggested by the arrangement of the teeth in the jaw of a serpent, used by Talus the nephew of Daedalus in dividing a piece of wood. From the representations of ancient tools found in the paintings at Herculaneum it appears that the frame-saw used by the ancients very nearly resembled that still in use; and we are informed that the tools employed in the carpenters' shops at Nazareth at this day are in most respects the same as those represented in the buried Roman city.

Another very ancient tool referred to in the Bible and in Homer was the File, which was used to sharpen weapons and implements. Thus the Hebrews "had a file for the mattocks, and for the coulters, and for the forks, and for the axes, and to sharpen the goads." [1] When to these we add the adze, plane-irons, the anger, and the chisel, we sum up the tools princ.i.p.ally relied on by the early mechanics for working in wood and iron.

Such continued to be the chief tools in use down almost to our own day.

The smith was at first the princ.i.p.al tool-maker; but special branches of trade were gradually established, devoted to tool-making. So long, however, as the workman relied mainly on his dexterity of hand, the amount of production was comparatively limited; for the number of skilled workmen was but small. The articles turned out by them, being the product of tedious manual labour, were too dear to come into common use, and were made almost exclusively for the richer cla.s.ses of the community. It was not until machinery had been invented and become generally adopted that many of the ordinary articles of necessity and of comfort were produced in sufficient abundance and at such prices as enabled them to enter into the consumption of the great body of the people.

But every improver of tools had a long and difficult battle to fight; for any improvement in their effective power was sure to touch the interests of some established craft. Especially was this the case with machines, which are but tools of a more complete though complicated kind than those above described.

Take, for instance, the case of the Saw. The tedious drudgery of dividing timber by the old fashioned hand-saw is well known. To avoid it, some ingenious person suggested that a number of saws should be fixed to a frame in a mill, so contrived as to work with a reciprocating motion, upwards and downwards, or backwards and forwards, and that this frame so mounted should be yoked to the mill wheel, and the saws driven by the power of wind or water. The plan was tried, and, as may readily be imagined, the amount of effective work done by this machine-saw was immense, compared with the tedious process of sawing by hand.

It will be observed, however, that the new method must have seriously interfered with the labour of the hand-sawyers; and it was but natural that they should regard the establishment of the saw-mills with suspicion and hostility. Hence a long period elapsed before the hand-sawyers would permit the new machinery to be set up and worked.

The first saw-mill in England was erected by a Dutchman, near London, in 1663, but was shortly abandoned in consequence of the determined hostility of the workmen. More than a century pa.s.sed before a second saw-mill was set up; when, in 1767, Mr. John Houghton, a London timber-merchant, by the desire and with the approbation of the Society of Arts, erected one at Limehouse, to be driven by wind. The work was directed by one James Stansfield, who had gone over to Holland for the purpose of learning the art of constructing and managing the sawing machinery. But the mill was no sooner erected than a mob a.s.sembled and razed it to the ground. The princ.i.p.al rioters having been punished, and the loss to the proprietor having been made good by the nation, a new mill was shortly after built, and it was suffered to work without further molestation.

Improved methods of manufacture have usually had to encounter the same kind of opposition. Thus, when the Flemish weavers came over to England in the seventeenth century, bringing with them their skill and their industry, they excited great jealousy and hostility amongst the native workmen. Their compet.i.tion as workmen was resented as an injury, but their improved machinery was regarded as a far greater source of mischief. In a memorial presented to the king in 1621 we find the London weavers complaining of the foreigners' compet.i.tion, but especially that "they have made so bould of late as to devise engines for working of tape, lace, ribbin, and such like, wherein one man doth more among them than 7 Englishe men can doe; so as their cheap sale of commodities beggereth all our Englishe artificers of that trade, and enricheth them." [2]

At a much more recent period new inventions have had to encounter serious rioting and machine-breaking fury. Kay of the fly-shuttle, Hargreaves of the spinning-jenny, and Arkwright of the spinning-frame, all had to fly from Lancashire, glad to escape with their lives.

Indeed, says Mr. Bazley, "so jealous were the people, and also the legislature, of everything calculated to supersede men's labour, that when the Sankey Ca.n.a.l, six miles long, near Warrington, was authorized about the middle of last century, it was on the express condition that the boats plying on it should be drawn by men only!" [3] Even improved agricultural tools and machines have had the same opposition to encounter; and in our own time bands of rural labourers have gone from farm to farm breaking drill-ploughs, winnowing, threshing, and other machines, down even to the common drills,--not perceiving that if their policy had proved successful, and tools could have been effectually destroyed, the human race would at once have been reduced to their teeth and nails, and civilization summarily abolished.[4] It is, no doubt, natural that the ordinary cla.s.s of workmen should regard with prejudice, if not with hostility, the introduction of machines calculated to place them at a disadvantage and to interfere with their usual employments; for to poor and not very far-seeing men the loss of daily bread is an appalling prospect. But invention does not stand still on that account. Human brains WILL work. Old tools are improved and new ones invented, superseding existing methods of production, though the weak and unskilled may occasionally be pushed aside or even trodden under foot. The consolation which remains is, that while the few suffer, society as a whole is vastly benefitted by the improved methods of production which are suggested, invented, and perfected by the experience of successive generations.

The living race is the inheritor of the industry and skill of all past times; and the civilization we enjoy is but the sum of the useful effects of labour during the past centuries. Nihil per saltum. By slow and often painful steps Nature's secrets have been mastered. Not an effort has been made but has had its influence. For no human labour is altogether lost; some remnant of useful effect surviving for the benefit of the race, if not of the individual. Even attempts apparently useless have not really been so, but have served in some way to advance man to higher knowledge, skill, or discipline. "The loss of a position gained," says Professor Thomson, "is an event unknown in the history of man's struggle with the forces of inanimate nature." A single step won gives a firmer foothold for further effort. The man may die, but the race survives and continues the work,--to use the poet's simile, mounting on stepping-stones of dead selves to higher selves.

Philarete Chasles, indeed, holds that it is the Human Race that is your true inventor: "As if to unite all generations," he says, "and to show that man can only act efficiently by a.s.sociation with others, it has been ordained that each inventor shall only interpret the first word of the problem he sets himself to solve, and that every great idea shall be the RESUME of the past at the same time that it is the germ of the future." And rarely does it happen that any discovery or invention of importance is made by one man alone. The threads of inquiry are taken up and traced, one labourer succeeding another, each tracing it a little further, often without apparent result. This goes on sometimes for centuries, until at length some man, greater perhaps than his fellows, seeking to fulfil the needs of his time, gathers the various threads together, treasures up the gain of past successes and failures, and uses them as the means for some solid achievement, Thus Newton discovered the law of gravitation, and thus James Watt invented the steam-engine. So also of the Locomotive, of which Robert Stephenson said, "It has not been the invention of any one man, but of a race of mechanical engineers." Or, as Joseph Bramah observed, in the preamble to his second Lock patent, "Among the number of patents granted there are comparatively few which can be called original so that it is difficult to say where the boundary of one ends and where that of another begins."

The arts are indeed reared but slowly; and it was a wise observation of Lord Bacon that we are too apt to pa.s.s those ladders by which they have been reared, and reflect the whole merit on the last new performer.

Thus, what is hailed as an original invention is often found to be but the result of a long succession of trials and experiments gradually following each other, which ought rather to be considered as a continuous series of achievements of the human mind than as the conquest of any single individual. It has sometimes taken centuries of experience to ascertain the value of a single fact in its various bearings. Like man himself, experience is feeble and apparently purposeless in its infancy, but acquires maturity and strength with age. Experience, however, is not limited to a lifetime, but is the stored-up wealth and power of our race. Even amidst the death of successive generations it is constantly advancing and acc.u.mulating, exhibiting at the same time the weakness and the power, the littleness and the greatness of our common humanity. And not only do we who live succeed to the actual results of our predecessors' labours,--to their works of learning and of art, their inventions and discoveries, their tools and machines, their roads, bridges, ca.n.a.ls, and railways,--but to the inborn apt.i.tudes of blood and brain which they bequeath to us, to that "educability," so to speak, which has been won for us by the labours of many generations, and forms our richest natural heritage.

The beginning of most inventions is very remote. The first idea, born within some unknown brain, pa.s.ses thence into others, and at last comes forth complete, after a parturition, it may be, of centuries. One starts the idea, another developes it, and so on progressively until at last it is elaborated and worked out in practice; but the first not less than the last is ent.i.tled to his share in the merit of the invention, were it only possible to measure and apportion it duly.

Sometimes a great original mind strikes upon some new vein of hidden power, and gives a powerful impulse to the inventive faculties of man, which lasts through generations. More frequently, however, inventions are not entirely new, but modifications of contrivances previously known, though to a few, and not yet brought into practical use.

Glancing back over the history of mechanism, we occasionally see an invention seemingly full born, when suddenly it drops out of sight, and we hear no more of it for centuries. It is taken up de novo by some inventor, stimulated by the needs of his time, and falling again upon the track, he recovers the old footmarks, follows them up, and completes the work.

There is also such a thing as inventions being born before their time--the advanced mind of one generation projecting that which cannot be executed for want of the requisite means; but in due process of time, when mechanism has got abreast of the original idea, it is at length carried out; and thus it is that modern inventors are enabled to effect many objects which their predecessors had tried in vain to accomplish. As Louis Napoleon has said, "Inventions born before their time must remain useless until the level of common intellects rises to comprehend them." For this reason, misfortune is often the lot of the inventor before his time, though glory and profit may belong to his successors. Hence the gift of inventing not unfrequently involves a yoke of sorrow. Many of the greatest inventors have lived neglected and died unrequited, before their merits could be recognised and estimated. Even if they succeed, they often raise up hosts of enemies in the persons whose methods they propose to supersede. Envy, malice, and detraction meet them in all their forms; they are a.s.sailed by combinations of rich and unscrupulous persons to wrest from them the profits of their ingenuity; and last and worst of all, the successful inventor often finds his claims to originality decried, and himself branded as a copyist and a pirate.

Among the inventions born out of time, and before the world could make adequate use of them, we can only find s.p.a.ce to allude to a few, though they are so many that one is almost disposed to accept the words of Chaucer as true, that "There is nothing new but what has once been old;" or, as another writer puts it, "There is nothing new but what has before been known and forgotten;" or, in the words of Solomon, "The thing that hath been is that which shall be, and there is no new thing under the sun." One of the most important of these is the use of Steam, which was well known to the ancients; but though it was used to grind drugs, to turn a spit, and to excite the wonder and fear of the credulous, a long time elapsed before it became employed as a useful motive-power. The inquiries and experiments on the subject extended through many ages. Friar Bacon, who flourished in the thirteenth century, seems fully to have antic.i.p.ated, in the following remarkable pa.s.sage, nearly all that steam could accomplish, as well as the hydraulic engine and the diving-bell, though the flying machine yet remains to be invented:--

"I will now," says the Friar, "mention some of the wonderful works of art and nature in which there is nothing of magic, and which magic could not perform. Instruments may be made by which the largest ships, with only one man guiding them, will be carried with greater velocity than if they were full of sailors. Chariots may be constructed that will move with incredible rapidity, without the help of animals.

Instruments of flying may be formed, in which a man, sitting at his ease and meditating on any subject, may beat the air with his artificial wings, after the manner of birds. A small instrument may be made to raise or depress the greatest weights. An instrument may be fabricated by which one man may draw a thousand men to him by force and against their will; as also machines which will enable men to walk at the bottom of seas or rivers without danger." It is possible that Friar Bacon derived his knowledge of the powers which he thus described from the traditions handed down of former inventions which had been neglected and allowed to fall into oblivion; for before the invention of printing, which enabled the results of investigation and experience to be treasured up in books, there was great risk of the inventions of one age being lost to the succeeding generations. Yet Disraeli the elder is of opinion that the Romans had invented printing without being aware of it; or perhaps the senate dreaded the inconveniences attending its use, and did not care to deprive a large body of scribes of their employment. They even used stereotypes, or immovable printing-types, to stamp impressions on their pottery, specimens of which still exist.

In China the art of printing is of great antiquity. Lithography was well known in Germany, by the very name which it still bears, nearly three hundred years before Senefelder reinvented it; and specimens of the ancient art are yet to be seen in the Royal Museum at Munich.[5]

Steam-locomotion by sea and land, had long been dreamt of and attempted. Blasco de Garay made his experiment in the harbour of Barcelona as early as 1543; Denis Papin made a similar attempt at Ca.s.sel in 1707; but it was not until Watt had solved the problem of the steam-engine that the idea of the steam-boat could be developed in practice, which was done by Miller of Dalswinton in 1788. Sages and poets have frequently foreshadowed inventions of great social moment.

Thus Dr. Darwin's antic.i.p.ation of the locomotive, in his Botanic Garden, published in 1791, before any locomotive had been invented, might almost be regarded as prophetic:

Soon shall thy arm, unconquered Steam! afar Drag the slow barge, and drive the rapid car.

Denis Papin first threw out the idea of atmospheric locomotion; and Gauthey, another Frenchman, in 1782 projected a method of conveying parcels and merchandise by subterraneous tubes,[6] after the method recently patented and brought into operation by the London Pneumatic Despatch Company. The balloon was an ancient Italian invention, revived by Mongolfier long after the original had been forgotten. Even the reaping machine is an old invention revived. Thus Barnabe Googe, the translator of a book from the German ent.i.tled 'The whole Arte and Trade of Husbandrie,' published in 1577, in the reign of Elizabeth, speaks of the reaping-machine as a worn-out invention--a thing "which was woont to be used in France. The device was a lowe kinde of carre with a couple of wheeles, and the frunt armed with sharpe syckles, whiche, forced by the beaste through the corne, did cut down al before it. This tricke," says Googe, "might be used in levell and champion countreys; but with us it wolde make but ill-favoured woorke." [7] The Thames Tunnel was thought an entirely new manifestation of engineering genius; but the tunnel under the Euphrates at ancient Babylon, and that under the wide mouth of the harbour at Ma.r.s.eilles (a much more difficult work), show that the ancients were beforehand with us in the art of tunnelling. Macadamized roads are as old as the Roman empire; and suspension bridges, though comparatively new in Europe, have been known in China for centuries.

There is every reason to believe--indeed it seems clear that the Romans knew of gunpowder, though they only used it for purposes of fireworks; while the secret of the destructive Greek fire has been lost altogether. When gunpowder came to be used for purposes of war, invention busied itself upon instruments of destruction. When recently examining the Museum of the a.r.s.enal at Venice, we were surprised to find numerous weapons of the fifteenth and sixteenth centuries embodying the most recent English improvements in arms, such as revolving pistols, rifled muskets, and breech-loading cannon. The latter, embodying Sir William Armstrong's modern idea, though in a rude form, had been fished up from the bottom of the Adriatic, where the ship armed with them had been sunk hundreds of years ago. Even Perkins's steam-gun was an old invention revived by Leonardo da Vinci and by him attributed to Archimedes.[8] The Congreve rocket is said to have an Eastern origin, Sir William Congreve having observed its destructive effects when employed by the forces under Tippoo Saib in the Mahratta war, on which he adopted and improved the missile, and brought out the invention as his own.

Coal-gas was regularly used by the Chinese for lighting purposes long before it was known amongst us. Hydropathy was generally practised by the Romans, who established baths wherever they went. Even chloroform is no new thing. The use of ether as an anaesthetic was known to Albertus Magnus, who flourished in the thirteenth century; and in his works he gives a recipe for its preparation. In 1681 Denis Papin published his Traite des Operations sans Douleur, showing that he had discovered methods of deadening pain. But the use of anaesthetics is much older than Albertus Magnus or Papin; for the ancients had their nepenthe and mandragora; the Chinese their mayo, and the Egyptians their hachisch (both preparations of Cannabis Indica), the effects of which in a great measure resemble those of chloroform. What is perhaps still more surprising is the circ.u.mstance that one of the most elegant of recent inventions, that of sun-painting by the daguerreotype, was in the fifteenth century known to Leonardo da Vinci,[9] whose skill as an architect and engraver, and whose accomplishments as a chemist and natural philosopher, have been almost entirely overshadowed by his genius as a painter.[10] The idea, thus early born, lay in oblivion until 1760, when the daguerreotype was again clearly indicated in a book published in Paris, written by a certain Tiphanie de la Roche, under the anagrammatic t.i.tle of Giphantie. Still later, at the beginning of the present century, we find Thomas Wedgwood, Sir Humphry Davy, and James Watt, making experiments on the action of light upon nitrate of silver; and only within the last few months a silvered copper-plate has been found amongst the old household lumber of Matthew Boulton (Watt's partner), having on it a representation of the old premises at Soho, apparently taken by some such process.[11]

In like manner the invention of the electric telegraph, supposed to be exclusively modern, was clearly indicated by Schwenter in his Delas.e.m.e.nts Physico-Mathematiques, published in 1636; and he there pointed out how two individuals could communicate with each other by means of the magnetic needle. A century later, in 1746, Le Monnier exhibited a series of experiments in the Royal Gardens at Paris, showing how electricity could be transmitted through iron wire 950 fathoms in length; and in 1753 we find one Charles Marshall publishing a remarkable description of the electric telegraph in the Scots Magazine, under the t.i.tle of 'An expeditions Method of conveying Intelligence.' Again, in 1760, we find George Louis Lesage, professor of mathematics at Geneva, promulgating his invention of an electric telegraph, which he eventually completed and set to work in 1774. This instrument was composed of twenty-four metallic wires, separate from each other and enclosed in a non-conducting substance. Each wire ended in a stalk mounted with a little ball of elder-wood suspended by a silk thread. When a stream of electricity, no matter how slight., was sent through the wire, the elder-ball at the opposite end was repelled, such movement designating some letter of the alphabet. A few years later we find Arthur Young, in his Travels in France, describing a similar machine invented by a M. Lomond of Paris, the action of which he also describes.[12] In these and similar cases, though the idea was born and the model of the invention was actually made, it still waited the advent of the scientific mechanical inventor who should bring it to perfection, and embody it in a practical working form.

Some of the most valuable inventions have descended to us without the names of their authors having been preserved. We are the inheritors of an immense legacy of the results of labour and ingenuity, but we know not the names of our benefactors. Who invented the watch as a measurer of time? Who invented the fast and loose pulley? Who invented the eccentric? Who, asks a mechanical inquirer,[13] "invented the method of cutting screws with stocks and dies? Whoever he might be, he was certainly a great benefactor of his species. Yet (adds the writer) his name is not known, though the invention has been so recent." This is not, however, the case with most modern inventions, the greater number of which are more or less disputed. Who was ent.i.tled to the merit of inventing printing has never yet been determined. Weber and Senefelder both laid claim to the invention of lithography, though it was merely an old German art revived. Even the invention of the penny-postage system by Sir Rowland Hill is disputed; Dr. Gray of the British Museum claiming to be its inventor, and a French writer alleging it to be an old French invention.[14] The invention of the steamboat has been claimed on behalf of Blasco de Garay, a Spaniard, Papin, a Frenchman, Jonathan Hulls, an Englishman, and Patrick Miller of Dalswinton, a Scotchman. The invention of the spinning machine has been variously attributed to Paul, Wyatt, Hargreaves, Higley, and Arkwright. The invention of the balance-spring was claimed by Huyghens, a Dutchman, Hautefeuille, a Frenchman, and Hooke, an Englishman. There is scarcely a point of detail in the locomotive but is the subject of dispute.

Thus the invention of the blast-pipe is claimed for Trevithick, George Stephenson, Goldsworthy Gurney, and Timothy Hackworth; that of the tubular boiler by Seguin, Stevens, Booth, and W. H. James; that of the link-motion by John Gray, Hugh Williams, and Robert Stephenson.