The Balloon-Hoax

Two very decided failures, of late, — those of Mr. Henson and Sir George Cayley — had much weakened the public interest in the subject of aerial navigation. Mr. Henson's scheme (which at first was considered very feasible even by men of science) was founded upon the principle of an inclined plane, started from an eminence by an extrinsic force, applied and continued by the revolution of impinging vanes, in form and number resembling the vanes of a windmill. But, in all the experiments made with models at the Adelaide Gallery, it was found that the operation of these fans not only did not propel the machine, but actually impeded its flight. The only propelling force it ever exhibited, was the mere impetus acquired from the descent of the inclined plane; and this impetus carried the machine farther when the vanes were at rest than when they were in motion — a fact which sufficiently demonstrates their inutility; and in the absence of the propelling, which was also the sustaining power, the whole fabric would necessarily descend. This consideration led Sir George Cayley to think only of adapting a propeller to some machine having of itself an independent power of support — in a word, to a balloon; the idea, however, being novel, or original, with Sir George, only so far as regards the mode of its application to practice. He exhibited a model of his invention at the Polytechnic Institution. The propelling principle, or power, was here, also, applied to interrupted surfaces, or vanes, put in revolution. These vanes were four in number, but were found entirely ineffectual in moving the balloon, or in aiding its ascending power. The whole project was thus a complete failure. It was at this juncture that Mr. Monck Mason (whose voyage from Dover to Weilburg in the balloon “Nassau,” occasioned so much excitement in 1837,) conceived the idea of employing the principle of the Archimedean screw for the purpose of propulsion through the air — rightly attributing the failure of Mr. Henson's scheme, and of Sir George Cayley's, to the interruption of surface in the independent vanes. He made the first public experiment at Willis's Rooms, but afterwards removed his model to the Adelaide Gallery. Like Sir George Cayley's balloon, his own was an ellipsoid. Its length was 13 feet 6 inches — height, 6 feet 8 inches. It contained about 320 cubic feet of gas, which, if pure hydrogen, would support 21 pounds upon its first inflation, before the gas has time to deteriorate or escape. The weight of the whole machine and apparatus was 17 pounds — leaving about 4 pounds to spare. Beneath the centre of the balloon, was a frame of light wood, about 9 feet long, and rigged on to the balloon itself with a net-work in the customary manner. From this framework was suspended a wicker basket or car. The mode of arrangement of the rudder and of the Archimedean screw, will be best shown in the annexed engraving, which we have been kindly permitted to use. So well satisfied, however, was Mr. Mason of the ultimate success of his invention, that he determined to construct immediately, if possible, a balloon of sufficient capacity to test the question by a voyage of some extent; the original design being to cross the British Channel, as before, in the Nassau balloon. To carry out his views, he solicited and obtained the patronage of Sir Everard Bringhurst, and Mr. Osborne, two gentlemen well known for scientific acquirement, and especially for the interest they have exhibited in the progress of aerostation. The project, at the desire of Mr. Osborne, was kept a profound secret from the public — the only persons entrusted with the design being those actually engaged in the construction of the machine, which was built, under the superintendence of Mr. Mason, Mr. Holland, Sir Everard Bringhurst, and Mr. Osborne, at the seat of the latter gentleman near Penstruthal, in Wales. Mr. Henson, accompanied by his friend Mr. Ainsworth, was admitted to a private view of the ballo