Here is my game. You know this
fellow--this strange unknown--is going to call up Mrs. Damon
to-morrow. Well, I'll be ready for him. I'm going to put in the booth
where he will telephone from, one of my photo telephones--that is, the
sending apparatus. In Mrs. Damon's house, attached to her telephone,
will be the receiving plate, as well as the phonograph cylinder."
"When this fellow starts to talk he'll be sending us his picture,
though he won't know it, and we'll be getting a record of his
voice. Then we'll have him just where we want him."
"Good!" cried Ned. "But, Tom, there's a weak spot in your mouse-
trap."
"What is it?"
"How are you going to know which telephone the unknown will call
up from? He may go to any of a hundred, more or less."
"He might--yes. But that's a chance we've got to take. It isn't so
much of a chance, though when you stop to think that he will
probably go to some public telephone in an isolated spot, and,
unless I'm much mistaken he will go to a telephone near where he
was to-day. He knows that was safe, since we didn't capture him,
and he's very likely to come back."
"But to make the thing as sure as possible, I'm going to attach my
apparatus to a number of public telephones in the vicinity of the
one near the sawmill. So if the fellow doesn't get caught in one,
he will in another. I admit it's taking a chance; but what else
can we do?"
"I suppose you're right, Tom.
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