"Do you think some one may hear you?" asked Ned.
"They might. I'm not taking any chances. But the reason I want to be
especially careful that Andy Foger doesn't spy on any of my
inventions is that at last I have perfected my noiseless airship
motor!"
"You have!" cried Ned, for he knew that his chum had been working
for a long time on this motor, that would give out no sound, no
matter at how high a speed it was run. "That's great, Tom! I
congratulate you. I don't wonder you don't want Andy to get even a
peep at it."
"Especially as I haven't it fully patented," went on the young
inventor. He had met with many failures in his efforts to perfect
this motor, which he intended to install on one of his airships. "If
any one saw the finished parts now it wouldn't take them long to
find out the secret of doing away with the noise."
"How do you do it?" asked Ned, for he realized that his chum had no
secrets from him.
"Well, it's too complicated to describe," said Tom, "but the secret
lies in a new way of feeding gasolene into the motor, a new sparking
device, and an improved muffler. I think I could start my new
airship in front of the most skittish horse, and he wouldn't stir,
for the racket wouldn't wake a baby.
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