At length that grand association the Inventors' Institution came to the rescue. The founders of the Inventors' Institution, though working really with the object of benefiting humanity, were much too wise to place the undertaking on a purely philanthropic basis. On the contrary, they constructed it on a commercial basis. The object was to encourage the progress of valuable inventions, and they were willing to lend sums from trifling amounts to very large ones to aid the development of any invention of which they approved. They might lend only a trifle to obtain a patent or a large sum to make exhaustive experiments. The borrower had to enter into a bond to repay the amount tenfold or to any less extent demanded by the Institution at its own discretion. It was clearly laid down that, when the invention proved a failure through no fault of the inventor, he would not be asked for any repayment. In case of moderate success, he would only be asked for moderate repayment, and so on. The fairness of the Institution's exercise of discretion was rarely, if ever, called into question. Once they lent nearly thirty thousand pounds to finally develop an invention. Within four years they called upon the inventor to repay nearly three hundred thousand, but he was nothing loath. The invention was a great commercial success and yielding him at the rate of nearly a million per annum. This association offered a large reward for the best suggestion as to the nature of an invention to render aerial travelling safe, quick, and economical. A remarkable paper gained the prize.
The writer was an eminent chemist. He expressed the opinion that the one possible means of success was the use of a power which, as in the case of explosives, could be easily produced from substances of comparative light weight. He urged, it was only of late years that any real knowledge of the nature of explosives was obtained. It was nearly four hundred years after the discovery of gunpowder before any possible substitutes were invented. It was again a long time before it was discovered that explosives partook of two distinctly separate characters. One was the quick or shattering compound producing instantaneous effect; the other was the slow or rending compound of more protracted action. He dwelt on the fact that in all cases the force yielded by explosives was through the change of a solid into a gaseous body, and that the volume of the gaseous body was greatly increased by the expansion consequent on the heat evolved during decomposition. The total amount of heat evolved during decomposition did not differ, but evidently the concentration of heat at any one time depended on the rapidity of the decomposition. The volume of gas, independent of expansion by heat, varied also with different substances. Blasting oil, for instance, gave nearly thirteen hundred times its own volume of gas, and this was increased more than eight times by the concentration of heat; gunpowder only yielded in gas expanded by heat eight hundred times its own volume: or, in other words, the one yielded through decomposition thirteen times the volume of the other. He went on to argue that what was required was the leisurely chemical decomposition of a solid into a gas without sensible explosion, and of such a slow character as to avoid the production of great heat. He referred, as an example of the change resulting from the contact of two bodies, to the effect of safety matches. The match would only ignite by contact with a specially prepared surface. This match was as great an improvement on the old primitive match, as would be a decomposing material the force of which could be controlled, an improvement on the present means of obtaining power. He expressed a positive opinion that substances could be found whose rapidity of decomposition, and consequent heat and strength, could be nicely regulated, so that a force could be employed which would not be too sudden nor too strong to be used in substitution of steam or compressed air. He was, moreover, of opinion that, instead of the substances being mixed ready for use, with the concurrent danger, a mode could be devised of bringing the different component parts into contact in a not dissimilar manner to the application of the safety match, thereby assuring absolute immunity from danger in the carriage of the materials. This discovery could be made, he went on to say; and upon it depended improvement in aerial travelling. Each fan could be impelled by a separate machine of a light weight, worked with perfect safety by a cheap material; for the probabilities were, the substance would be cheaply producible. Each aerial vessel should carry three or four times the number of separate fans and machinery necessary to obtain buoyancy. The same substances probably could be used to procure buoyancy in the improbable event of all the machines breaking down. Supposing, as he suspected would be the case, that the resultant gas of the decomposition was lighter than air, a hollow case of a strong elastic fabric could be fastened to the whole of the outside exposed surface of the machine; and this could be rapidly inflated by the use of the same material. The movement of a button should be sufficient to produce decomposition, and as a consequence to charge the whole of this casing with gas lighter than the air. As the heat attending the decomposition subsided the elastic fabric would sufficiently collapse. The danger then would not be so much of descending too rapidly through the atmosphere as of remaining in it; a difficulty, however, which a system of valves would easily overcome.
The Institution offered twenty-five thousand pounds for a discovery on the lines indicated; and the Government offered seventy-five thousand pounds more on the condition that they should have the right to purchase the invention and preserve it as a secret, they supplying the material for civil purposes, but retaining absolute control over it for military purposes. This proviso was inserted because of the opinion of the writer that the effects he looked for might not so much depend on the chemical composition of the substances as on their molecular conditions, and that these might defy the efforts of analysts. If he was wrong, and the nature of the compound could be ascertained by analysis, the Government need not buy the invention; they could leave the discoverer to enjoy its advantages by patenting it, and share with other nations the uses that could be made of it for purposes of warfare.
It was some time before the investigations were completely successful. There was no lack of attention to the subject, the inducements being so splendid. Many fatal accidents occurred through the widely spread attention given to the properties of explosives and to the possibility of modifying their effects. On one occasion it was thought that success was attained. Laboratory experiments were entirely satisfactory, and at length it was determined to have a grand trial of the substance. A large quantity was prepared, and it was applied to the production of power in various descriptions of machinery. Many distinguished people were present, including a Cabinet Minister, a Lord of the Admiralty, the Under-Secretary for Defence, the President of the Inventors' Institution, several members of Parliament, a dozen or more distinguished men and women of science, and the inventor himself. The assemblage was a brilliant one; but, alas! not one of those present lived to record an opinion of the invention. The substance discovered was evidently not wanting in power. How far it was successful no one ever learnt. It may have been faultily made or injudiciously employed. But the very nature of the composition was lost, for the inventor went with the rest. An explosion occurred; and all the men and women within the building were scattered miles around, with fragments of the edifice itself. The largest recognisable human remains discovered were the well-defined joint of a little finger. A great commotion followed. The eminent chemist who wrote the paper suggesting the discovery was covered with obloquy. Suggestions were made that the law should restrain such investigations. Some people went so far as to describe them as diabolical. All things, however, come to those who wait; and at length a discovery was made faithfully resembling the one prognosticated by the great chemist.
Strange to say, the inventor or discoverer was a young Jewish woman not yet thirty years of age. From childhood she had taken an intense interest in the question, and the terrible accident above recorded seemed to spur her on to further exertion. She had a wonderful knowledge of ancient languages, and she searched for information concerning chemical secrets which she believed lost to the present day. She had a notion that the atomic structure of substances was better known to students in the early ages. It was said that the hint she acted on was conveyed to her by some passage in a Chaldean inscription of great antiquity. She neither admitted nor denied it. Perhaps the susceptibilities of an intensely Eastern nature led her to welcome the halo of romance cast over her discovery. Be that as it may, it is certain she discovered a substance, or rather substances which, brought into contact with each other, faithfully fulfilled all that the chemist had ventured to suggest. Together with unwavering efficiency there was perfect safety; and so much of the action depended on the structure, not the composition, that the efforts of thousands of savants failed to discover the secret of the invention. What the substances were in composition, and what they became after decomposition was easily determined, but how to make them in a form that fulfilled the purpose required defied every investigation.
The inventor did not patent her invention. After making an enormous fortune from it, she sold it to the Government, who took over the manufactory and its secrets; and whilst they sold it in quantity for ordinary use, they jealously guarded against its accumulation in foreign countries for possible warlike purposes. This invention, as much almost as its vast naval and military forces, gave to the empire of Britain the great power it possessed. The United States alone affected to underrate that power. It was the habit of Americans to declare that they did not believe in standing armies or fleets. If they wanted to fight, they could afford to spend any amount of treasure; and they could do more in the way of organising than any nation in the world. They were not going to spend money on keeping themselves in readiness for what might never happen. But we have not now to consider the aerial ships from their warlike point of view.
It should be mentioned that the inventor of this new form of power was the aunt of Colonel Laurient. She died nearly twenty years before this history, and left to him, her favourite nephew, so much of her gigantic fortune as the law permitted her to devise to one inheritor.
IX.