On the day after the sun had been restored, Sam was back in his laboratory, still feeling out the strange forces in the ether, and trying to anticipate the next attack. I was wandering along the beach, rejoicing in the bright warmth of the sun, absorbing the spell of the wood and the sea and the fresh salty air, regretting that all of it might be frozen again. There an idea came abruptly to me.
Why not build the Omnimobile?
Designed to withstand the bitter cold and the absolute vacuum of space, planned to survive the shock of landing on frozen worlds, equipped to traverse the terrible mountains of the moon, to crawl over the burned deserts of Mars, or to explore the vast seas of Venus—even if it would not be able actually to leave the earth, might it not preserve our lives when the frozen night came again?
A bitter existence it might seem, to spend one's years shut up in a metal cylinder, in a dark and frozen world, traveling, perhaps, in absolute night, over still, unseen cities of the dead. But I had my books—and the Green Girl! I could live on with that wonderful princess of my dreams, and forget the doom of my kind! It seemed selfish to think of it—but my love of the Green Girl was so great that I would have given my all for her, even to dream of her!
When I reached the cottage I spoke to Sam of my idea, and he agreed with an alacrity that surprised me. We tested the little model again, and he made revisions and alterations in the design. In a few days we began construction on the beach two hundred yards below the cottage. There was no lack of funds, and we pushed the work with all speed. We had a hundred workmen on the spot, and shops all over the country were busy turning out the parts and instruments which were rushed to us by air. I superintended the work myself, since Sam still spent most of his time in the little laboratory, working with that mysterious force.
The Omnimobile, conceived and designed by Sam, would have been worthy of a Jules Verne's creative mind, and the great adventure into which it led us was far more weirdly amazing than any of those old wonder tales to which I had so passionately devoted myself. Without the hydrodyne, and a dozen other inventions of Sam's, the machine would have been impossible. Certainly it merited the name Omnimobile, for it was hard to imagine a place to which it would not be able to go.
The vessel was of a tapering cylindrical shape, ten feet in central diameter, and forty-five feet long. The construction throughout was of the strongest modern alloys of aluminum and beryllium. The hull was ingeniously braced to enable it to withstand tremendous shocks or immense pressure. The ship carried an equipment of hydrodyne generators totalling more than five hundred thousand horse-power—an absurdly large power plant, it seemed to me.
The machine had caterpillar tread for travel over-land or over the ocean floor, screws for propulsion over the water, vanes and rudders for diving, and another more unusual feature—rocket tubes to drive it through air or through empty space! They were of Sam's invention, and of novel design. They were loaded with water, and contained resistance coils through which a tremendous current could be sent from the generators, heating the special metal tubes to a temperature of some thousands of degrees, and converting the water into super-heated steam at enormous pressure, which, escaping at the nozzles, would propel the ship by reaction.
According to Sam's figures, the machine should be able to hurl itself a hundred miles in ten minutes, but it seemed very unlikely that it would ever be able to develop the speed of seven miles per second required to get clear of the earth's gravitation.
Amidships, above the control cabin, was a low revolving turret, or conning-tower, containing a second instrument board, so that the machine could be driven either from there or from below. It carried not only periscopes and other instruments, but a two-inch automatic cannon, of a recent design, capable of firing gas, shrapnel, or high-explosive shells at the rate of two hundred and twenty per minute. There was a small torpedo tube forward; and, as a further addition to the armament, Sam had installed transformer and projectors for using the half-million horse-power of the generators to produce a vast electric arc.