But the war can't
last forever."
"No," agreed Tom with a sigh, as he put away her letter, "and
thank goodness that it can't!"
The young inventor threw himself into the perplexing work of
inventing a silent motor with all the fervor he had given to the
production of his war tank, his giant cannon, his wonderful
searchlight and other machines.
"And," mused Tom, as he sat at his work table with pencil and
paper before him, "since this is a problem in acoustics, I had
best begin. I suppose by going back to first principles, and
after determining what makes an aeroplane engine noisy, try to
figure out how to make it quiet. Now as to the first, the
principle causes of noise are--"
And at that instant there broke on Tom's ears a succession of
discordant sounds which seemed to be a combination of an Indian's
war whoop and a college student's yells at a football game.
"Now I wonder what that is!" mused the young inventor as he
hastily arose. "Better solve that problem before I tackle the
aeroplane motor."
CHAPTER VIII
THROUGH THE ROOF
Tom rushed from his private office, and when he reached the
outer door he heard with more distinctness the sounds that had
alarmed him.
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