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paraffin on which our motors run. See those pipes. They are of the best, cold-drawn steel. They convey the oil from our pumps to the various propellers, to the lift and to any part where we have need for power. No corner is too sharp for them. They run anywhere, and, as you can imagine, convey the power of these engines with a certainty there is no gainsaying. Of course, at the far end we have other rotary motors. The oil pumped at this point, and under high pressure, is unable to escape from the steel pipes. At will we pass it into our distant motors, allowing some to escape back in this direction through a bypass. If the bypass is pulled wide open, the motors beyond do not turn; for the oil fails to reach them. If it is closed, there is no escape for the oil. It reaches the motors at its highest pressure, and operates them at full power, as powerfully, in fact, as if this engine down here driving the pumps was away up there close to the propeller with the shaft directly coupled to it. In short, and as an interesting fact, our propellers and other gear are operated by hydraulic power, applied after the latest principle."

      "Which is a lesson that will keep you for a while," smiled the Commander. "Ah, there's our host, and I hear the breakfast gong sounding. Come, Dick, my lad, you could eat, you think? the great height at which we fly does not rob you of your appetite?"

      Not by a long way. The young fellow was beginning to revel in his strange surroundings, and to quite like this residence at a height. More than all, he was vastly interested in the intricacies of the vessel. And we record only the fact when we say that he and Alec spent the whole of the morning in a close and thorough investigation, an investigation which disclosed, among other matters, the interesting fact that centrally-placed propellers, operating in tubes built transversely at either end of the ship, controlled her sideways movements, making entrance to a hangar easy, while she could be caused to descend or rise by others, located fore and aft likewise, with their tubes built in the vertical direction. As for the huge framework that held the gas, it was divided into twenty compartments, to each of which pipes of that strange transparent material led. These latter ended in one large branch which was attached to a machine at one end of the engine-room. Joe explained its action with a gusto that showed it to be one of his pet items, one on which he prided himself not a little.

      "What's the good of a ship which has to constantly return to land for gas supplies?" he said. "We take ours with us. Not compressed and in steel cylinders. Anyone can do that. But in the form of fuel. We carry a matter of seven tons, and can get a further supply in any part of the world. A gas producer of my own designing deals with the stuff, and at desire we can supply gas to replace leakages. Not that we experience those. Otherwise it would not be safe to smoke. But each one of our compartments aboard the ship contains a proportion of air. When we want to go higher, or lift a bigger weight, we simply set the producer going, and by means of one of our motors pump gas to the top of the compartments. Simple, isn't it? But it makes us wonderfully independent. That's why we've undertaken to make a trip round the world."

      "Round the world? When?"

      "Now – to-morrow, that is to say."

      "And – and I go with you?" gasped Dick.

      "Of course; you've been detailed by the Admiralty."

      The shout which the midshipman gave might have been heard at the far end of the vessel. The prospect filled him with delight, so that he was simply boiling over with enthusiasm and anticipation. Nor did his excitement evaporate as the day advanced. For the ship manœuvred over the ocean, and was put through her paces. Towards evening, however, her nose was turned to the north-east, and as night fell she hovered over England. Slowly she descended, obscured in darkness, till her pilot was able to pick up his bearings. A distant light of curious colour caught his eye and he sent the ship towards it. Then, when directly overhead that same brilliant light suddenly shot from the ship and flooded the buildings beneath. Dick found himself looking down upon a huge shed, placed in a wide-open place, and – could he believe his eyes? – the shed was moving, revolving, actually turning. It made him giddy. Or was it this wonderful ship which was turning?

      "It's the revolving hangar, of course," Alec told him, with a laugh. "You see, if the wind's blowing, we head up to it. The hangar opens away from the point from which the gale comes. We manœuvre opposite it, and enter easily. You watch. No one is wanted to hang on to ropes. Our pilot can manage the ship in any direction. See, we've dropped opposite the shed; but we're not quite head on. We're getting near it, however, for those propellers located in the cross tubes are being set to work. Ah! that's better. See, we're creeping in. Now our huge lateral keels run into wide slots built into the sides of the hangar. They engage and run in farther. Right! We're home. Welcome to our kennel."

      And what of the trip promised by Joe Gresson, and of the adventures it might and certainly should bring in its train?

      "Jingo!" cried Dick, as he hastened to the post office to send a telegram requesting that his full kit might be sent to him. "Jingo, if we don't have a cruise worth talking about, well – well, my name ain't Dicky."

      CHAPTER VI

      Carl Reitberg, Sportsman

      It may be imagined that the manufacture of an airship such as Dick Hamshaw had been introduced to, the child of Joe Gresson's clever brain, was not the work of a day. Four months had slipped by since that eventful day on which the young inventor and his uncle, Andrew Provost, had witnessed the flight of the Zeppelin outside Hamburg, and had accepted Carl Reitberg's somewhat arrogant challenge.

      Nor did the trial flights of this wonderful vessel escape public notice, though, it is true, her hull was practically invisible. But the rescue of a naval party sent to help a foundered aviator was bound to be reported, so that on the very morning after Andrew and his friends reached their hangar, the journals were filled with this new mystery, while columns, indeed, were devoted to this new airship.

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