"But there is enormous pressure to overcome, Tom. You must be
sure your muffler will stand the strain. Otherwise she is going
to blow out a gasket some day, when you least expect it. Then the
sudden resumption of pressure outside the cylinders is going to
cause a change in the equilibrium, and you may turn turtle in the
air."
"I've thought of that," said Tom. "At worst it can't be any
more than looping the loop. But I'll make the muffler doubly
strong."
"Better provide an auxiliary chamber to take care of part of
the exhaust in case your main apparatus breaks," advised the
older inventor, and Tom said he would. He did, too, for he valued
his father's expert advice.
Meanwhile he was busy fitting one of his latest aeroplanes with
the new motor. The motor he and Mr. Damon had used in their
flight was one patched up from an old one. But now Tom was
working on a complete new one, made after his revised model, and
in which the silencer was an integral part, instead of being
built on.
While giving Mary and her mother all the assistance in his
power, Tom still found time to work on his new, pet scheme.
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