Damon his liberty.
There was also the phonograph cylinder to record the man's voice.
Several times, while waiting for the call to come in, Tom got up
to test the apparatus. It was in perfect working order.
As before, there was an extension telephone, so that Mrs. Damon
could talk to the unknown, while Tom could hear as well. But he
planned to take no part in the conversation unless something
unforeseen occurred.
Mr. Damon was an enthusiastic photographer, and he had a dark room
adjoining his library. It was in this dark room that Tom planned
to develop the photo telephone plate.
On this occasion he was not going to use the metal plate in which,
ordinarily, the image of the person talking appeared. That record
was but a fleeting one, as in a mirror. This time Tom wanted a
permanent picture that could, if necessary, be used in a court of
justice.
Tom's plan was this: If the person who had demanded the papers
came to one of the photo telephones, and spoke to Mrs. Damon, Tom
would switch on the receiving apparatus. Thus, while the man was
talking, his picture would be taken, though he would not know of
the thing being done.
His voice would also be recorded on the wax cylinder, and he would
be equally unaware of this.
When Tom had imprinted the fellow's image on the prepared plate,
he would go quickly to the dark room and develop it.
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