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.