You're doing your bit, all right."
"And so is Tom Swift!" exclaimed Mr. Damon, as if there
had been an implied accusation against the young inventor.
"I heard, only to-day, that one of his inventions--a gas
helmet that he planned--is in use on the Western front in
Europe. Tom gave his patents to the government, and even
made a lot of the helmets free to show other factories how
to turn them out to advantage."
"He did?" cried Mr. Nestor.
"That's what he did. Talk about doing your bit--"
"I didn't know that," observed Mary's father slowly. "Do
you suppose it's a test of another gas helmet that Tom has
asked us out to see to-night?"
"I hardly think so," said Ned. "He wouldn't wait until
after dark for that This is something big, and Tom must
intend to have it out in the open. He probably waited until
after sunset so the neighbors wouldn't come out in flocks.
There's been a lot of talk about what is going on in Shop
Thirteen, especially since the arrest of the German spies,
and the least hint that a test is under way would bring out
a big crowd.
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