The Air Ship Boys : Or, the Quest of the Aztec Treasure

by H. L. Sayler

"Shut her off," exclaimed Alan joyously, as the white arms flew round and round and the air shot backwards on both sides of the long car. At 750 revolutions the car was rocking and lurching as if it would soar birdlike into the air. At 800 the powerful pulling propeller began to overcome the rigidity of the framework on which the car rested and as Alan caught and held the car, fearful that it was about to fly away under the propeller power alone, Ned shut off the engine.

The next instant the two boys, with clasped hands, were doing an Indian war dance in their glee.

It was not long until the rudder wires and the aeroplane shafts had been attached to their proper guide wheels in the lookout or pilot portion of the engine cabin. Then came the preparation of the balloon bag itself. Here again Ned showed what he had accomplished in the six weeks he had spent in the East.

Clearing a space near the generating tanks, they placed the one hundred sand bags, weighing forty pounds each, in parallel rows. These sacks, with convenient loops on each for attaching the rigging of the bag as it was being filled, had already been prepared by the "greaser" laborers, but the placing of the two tons of dead weight was not a joke, and the boys regretted that they had not kept a few men around. But by noon this was done, and then the great waterproof fiber trunk containing the silk bag was rolled out between the retaining bags. The boys could not carry it, as the balloon itself weighed seven hundred and twenty pounds, but they improvised rollers and with many a laughing "yo he ho" finally accomplished the task.

The bag had been made by one of the leading aeronautical engineers of America, whose factory, strangely enough, was in one of the small inland towns of New York State. In a spirit of humor the manufactory had been termed the "Balloon Farm," and so famous was it that Ned had even planned to spend a part of his summer vacation visiting it. When Major Honeywell gave him the opportunity, Ned was at once determined to utilize every advanced idea of the skilled owner, whatever the cost.

The result was a machine-varnished and, as nearly as such a thing was possible, hydrogen gas-proof bag. In the construction of this the experienced manufacturer and engineer, who was no other than Professor Carl E. Meyers, the hero of hundreds of ascents, had used a new machine which applied simultaneously to both sides of the bag fabric several thin films of elastic varnish. The bag itself consisted of two layers of Japan silk between which was a layer of rubber, all being sewed together and then vulcanized.

But the balloon trunk was not opened at once. The pipe to convey the gas from the cooler and purifying tank had been brought in four-foot lengths of light wood, cemented and shellacked. Eight lengths of these were laid to the center of the cleared place and then the joints were wound with binding cement tape. When these things had been satisfactorily adjusted it was mid-afternoon. Everything now seemed ready for the filling up of the generating tanks, the inflation, the flight, and "good-bye."

Therefore, a final consultation was held. Wind tests conducted each day had shown the prevailing breezes favorable, or at least not against the aeronauts. The inflation would require approximately ten hours. If begun at once this would make the departure possible about midnight. This was not undesirable as the absence of the hot southwestern sun would make the gas easier to control. But another thing had to be taken into consideration. Only four days had elapsed since Elmer and Bob and Buck had started. Were they yet at the rendezvous?

"I don't see what difference that makes," said Alan. "We expect to sail directly north and east of the foothills. If they have not reached their camp they must be nearly there and on the way. We've got to locate them with our glasses anyway. Let's start and pick them up where we find them."

"True enough," answered Ned. "The way the engine is working, in this light favoring wind, we ought to make eighteen miles an hour anyway. If we leave at midnight, by five o'clock in the morning we can be ninety miles north. The only trouble is in the handling of the bag. It's going to take at least twenty men to move the inflated bag from the retaining weights to the car and we can't make the rigging fast in the dark. We'd better begin work at four o'clock to-morrow morning, as soon as it begins to be light, and get away about two in the afternoon. I think we'll see our friends about seven or just at dark, if we do."