overhead. Tom carried aboard his craft the chemicals needed to generate the powerful lifting gas, of which he alone had the secret. It was more powerful than hydrogen, and simple to make. The balloon of the Flyer was now being distended.
Meanwhile Tom, with Koku, Mr. Damon and Mr. Nestor to help him, worked over the deflecting rudder, and also on the equilibrium mechanism. But they could not get either to operate.
Ned stood by the gas machine, and worked it to the limit. But even with all that energy, so powerful was the wind, that the Flyer rose slowly, the gale actually holding her down as a waterlogged craft is held below the waves. Ordinarily, with the gas machine set at its limit the craft would have shot up rapidly.
At times the airship would skim along on the level, and again it would be pitched and tossed about, until it was all the occupants could do to keep their feet. Mr. Damon was continually blessing everything he could remember.
"Now she's going!" suddenly cried Ned, as he looked at the dials registering the pressure of the gas, and showing the height of the airship above the earth.
"Going how?" gasped Tom, as he looked over
