was a cheer from the few spectators. Certainly the Whizzer made good time on the earth.
Tom was anxiously watching the gages and other instruments. He wanted a little more speed, but could not seem to get it. He ran the motor to the utmost, and then, seeing the necessity of making an attempt to get up into the air, before the end of the speeding ground was reached, he pulled the elevating plane lever.
The front of the Whizzer rose, and then settled down. Tom quickly shut off the power, and jammed on the brake, an arrangement of spikes that dug into the earth, for the high board fence loomed up before him.
"What's the matter?" cried Mr. Fenwick, anxiously.
"Couldn't get up speed enough," answered the young inventor. "We must have more momentum to make her rise."
"Can it be gotten?"
"I think so. I'll gear the motor higher."
It took an hour to do this. Once more the scale test was applied. It registered a pull of fifteen hundred pounds now.
"We'll go up," said Tom, grimly.
Once more the motors spit out fire, and the propellers whirled so that they looked like mere circles of light. Once more the Whizzer shot
