as he did, shouldn’t have made that mistake. Anyway, in Dover, St. Ives arranged for the dirigible to fetch me out of Norway, and then set about hiring a balloon for himself and Hasbro. They didn’t wait for me—they couldn’t—and I’m narrating their exploits as accurately as I can, having got the story secondhand, but straight from the horse’s mouth, of course.
St. Ives set about constructing a bismuth spiral, which, for the reader unfamiliar with the mysteries of magnetism, is a simple snail-shell spiral of bismuth connected to a meter that reads changes of resistance in the spiral to determine intensities of magnetic fields. It’s a child’s toy, comparatively speaking, but foolproof. The very simplicity of St. Ives’s notion infuriated him even further. It was something that ought to have been accomplished a week earlier, in time to save those ten men.
He affixed the spiral to a pole that they could slip down through a small hiatus in the basket of the balloon, so as to suspend the spiral just above the waves, making the whole business of taking a reading absolutely dangerous—almost deadly, as it turned out— because it required their navigating the balloon perilously close to the sea itself. Why didn’t they use a length of rope, instead— play out the line while staying safely aloft? That was my question too; and the answer, in short, is that the science of electricity and magnetism wouldn’t allow for it: the length of wire connecting the bismuth to the meter must be as short as possible for the reading to be accurate—that was how St. Ives understood it, although his understanding was nearly the death of him.
He meant to discover where Lord Kelvin’s machine—the enormously powerful electromagnet stolen from the machine works in Holborn—lay beneath the sea, somewhere in the Dover Strait. He assumed that it rested on a submerged platform or on a shallow sandy shoal. Maybe it was anchored, but then again maybe it was slowly drifting at the whim of deepwater currents. He suspected the existence of a float or buoy of some sort, both to locate it and, perhaps, to effect its switching on and off.
The two of them were aloft within a day. It was doubtful that the ban on local shipping would last out the week; the economy wouldn’t stand it. The government would pay the ransom or get used to the notion of losing ships. The Royal Academy still denied everything, right down to the ground, while at the same time working furiously to solve the mystery themselves.
St. Ives and Hasbro scoured the surface of the sea, from Ramsgate to Dungeness. Hasbro, an accomplished balloonist—the blue-ribbon winner, in fact, of the Trans-European balloon races of 1883—grappled with the problem of buoyancy, of keeping the basket above the licking waves in order not to drown St. Ives’s apparatus. The wind blew down out of the North Sea in gusts, buffeting them southward toward the coast of France, and it took all of Hasbro’s skill to steady their course at all. St. Ives had fashioned a sort of ballasted sea anchor that they dragged along and so avoided being blown across the coast of Normandy before discovering anything.
Even so, it finally began to seem as if their efforts were in vain— the Strait being almost inconceivably vast from the perspective of two men in a balloon. It was sometime late in the afternoon, when they were just on the edge of giving up, that they saw a sloop flying the ensign of the Royal Academy. St. Ives could see Parsons on the deck, and he waved to the man, who, after seeming to ascertain who it was that hailed him, replied with a perfunctory little nod and went immediately below decks. There was the chance, of course, that the Academy had already discovered the spot where the device had been sunk. And there was the chance that they were still searching. What would St. Ives do? What could he do?
They swept across her bow and passed her, St. Ives lowering the bismuth spiral one last time to take another reading. It registered some little bit of deviation, the needle swinging around fairly sharply as they drove along south and west, away from Parsons’s sloop.
They were two hundred yards off his port bow when the balloon lurched, throwing both the professor and Hasbro into the basket wall in a tangle of arms and legs. The basket tilted ominously, nearly pouring them into the sea. Hasbro hacked