Part 5 (1/2)

They were more than astonished at what they saw. They had no idea that the rough shed held such a perfect piece of machinery.

Up near the roof of the place, which was quite high, there swayed an immense bag of oiled silk. It was shaped like a cigar, big in the middle and tapering at both ends. The bag was enclosed in a net of ropes which extended down to the lower part of the airs.h.i.+p.

This lower part, as the boys could see, was just like a steam launch in shape, only much lighter in weight. It had a sharp bow, and a blunt stern. From the stern there extended a large propeller, the blades being made from sheets of aluminum.

The main part of the s.h.i.+p proper, or the part suspended from the gas bag, was covered by a closed and roofed cabin about forty feet long, ten feet wide, and extending five feet above the gunwale of the s.h.i.+p. The cabin had four windows on each side, a companionway fore and aft, and a sort of look-out or conning tower forward, which, the professor explained, was the place for the steersman.

”Because this s.h.i.+p can be steered wherever you want to go,” he said, pointing to the big rudder that was hung aft, an opening in it allowing the screw or propeller to revolve.

The boys were lost in admiration of the wonderful airs.h.i.+p. They were consumed with curiosity as to how the machinery worked, and they thought no more of their knocks and bruises than as if a mosquito had bitten them. The professor watched their faces with delight. He loved boys and mechanical apparatus.

”Now we will enter the _Monarch_,” he said. ”Turn on the lights, Was.h.i.+ngton.”

There was a click, and the cabin of the airs.h.i.+p was flooded with a soft glow of incandescent lamps.

”Come on!” called Mr. Henderson, leading the way. The boys followed, marveling at the wonders on every side.

They found the cabin of the strange craft divided into three parts.

First came a sort of parlor, with a table and seats arranged on the sides. In the front part of this was a pa.s.sage leading to the conning tower, or the place for the steersman. Behind the parlor came the sleeping quarters and dining room combined. The bunks were arranged to fold against the wall, and a table in the centre could be shut up when not in use and hoisted to the ceiling, giving plenty of s.p.a.ce.

Next came the engine room, and as they entered it the boys could hardly restrain from giving cheers of delight. It was almost filled with machinery, and occupied a little more than half of the whole boat, being twenty-two by ten feet in size.

The two boys did not know the use of one quarter of the machinery and apparatus they gazed on. There were electric motors, storage batteries, two gasoline engines similar to those used in automobiles, pumps, large and small tanks, instruments for measuring the electric current, for telling the temperature, the amount of moisture in the air, the speed of the wind, the speed of the s.h.i.+p, the height to which it went, besides compa.s.ses, barometers, telescopes, and other instruments.

There were levers and wheels on every side, switches, valves, electric plugs and handles. Lockers arranged close to the wall and along the floor held supplies and materials. Everything was new and s.h.i.+ning, and the professor smiled with pride as he touched piece after piece of machinery, and looked at the different instruments.

”Now we'll go out on the stern,” he said.

The boys followed as he ascended the companion steps and emerged on a small platform at the rear end of the cabin.

”Do you know what this is?” asked the professor, touching a long, thin, round object.

”Looks like a gun,” replied Mark.

”That's just what it is. It's a machine gun that will fire one hundred shots a minute, and it can be turned in any direction, as it works on a swivel. I don't know that we'll have any use for it, but I thought I'd take it along.”

Then the professor pointed out where the propeller shaft ran from the engine room out through the stern, and showed how the rudder was worked by wire ropes extending from it to the conning tower.

”In short we have everything necessary to successfully navigate the air,” he went on. ”Not a thing has been overlooked. All I have to do is to fill the big bag of oiled silk with a new gas I have discovered and up we go. This is really the most important part of the invention.

Without this powerful gas the airs.h.i.+p would not rise above the earth.

”But I have found this gas, which can be made in unlimited quant.i.ties from simple materials that we can carry with us. The gas has enormous lifting power, and if it was not for that I would not dare make such a large and comfortable airs.h.i.+p. As it is, we can sail through the air as easily as if we were on an ocean liner on the sea and much more quickly.

”I generate the gas in the engine room as I need it,” the professor went on. ”It goes to the oiled silk bag through two tubes. When we have arisen to a sufficient height I start the electric engine, the propeller whirls around, and the s.h.i.+p moves forward, just as a steamboat does when the screw is set in motion. Then all I have to do is to steer.”

”It's great!” cried Jack with sparkling eyes.