Here and there could be seen nervous men, who were anxious for the fate of some weird machine that a careless truckman had agreed to deliver. One such man was admonishing the driver of a big wagon, on which was a large case.

“Now be very careful of that—very careful,” the owner was saying. “The least jar will displace some of the delicate springs, and shift the center of gravity, besides disturbing the equilibrium of the centrifugal planes. Careful, now—look out!”

The ground was uneven, and, in driving, the truckman reined his horses into a hollow. The vehicle careened, and the big case was on the verge of falling off.

“Oh! Oh! Catch it! Quick! It will be smashed! The work of ten years will be ruined!” cried the inventor.

He was walking alongside the truck, and he tried to hold the case from sliding off the inclined platform by bracing his hands against it. But it was too heavy for him and continued to move toward the ground.

“Let’s help him,” suggested Jerry, and with one accord the boys jumped from the auto, which Jerry had stopped, and ran to the aid of the man. They managed to stop the case from sliding off, and by that time the driver had urged his horses to a level place.

“I don’t know how to thank you!” exclaimed the inventor to Andy and the motor boys. “If that case had fallen to the ground my airship would have been smashed. I am a thousand times obliged to you. That is my tent over there. Now, be very careful, truckman.”

“Aw, sure I’ll be careful. But I never see such uneven ground. What sort of an airship is it, anyhow, if a little fall like that will smash it? Sure, what’ll yez do when ye falls from the sky? Answer me that.”

Clearly he was not a firm believer in the future of airships.

“A fall, no matter from what height, will not matter when my ship is in operation, for the centrifugal planes and the equalizing balances will render any descent harmless,” declared the inventor. “Now, continue on, Mr. Truckman, if you please. I am very much obliged to you young gentlemen. Are you exhibiting here? If so I may have a race in the air with you.”