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132 apart they can both see and talk to one another."

"That's a big contract, Tom."

"Yes, but you've seen that it can be done. Then another thing I want to do is to have it arranged so that I can make a photograph of a person over a wire."

"Meaning what?"

"Meaning that if a certain person talks to me over the wire, I can turn my switch, and get a picture of him here at my apparatus connected with my telephone. To do that I'll merely need a sending apparatus at the other end of the telephone line—not a receiving machine."

"Could you arrange it so that the person who was talking to you would have his picture taken whether he wanted it or not?" asked Ned.

"Yes, it might be done," spoke Tom, thoughtfully. "I could conceal the sending plate somewhere in the telephone booth, and arrange the proper light, I suppose."

"That might be a good way in which to catch a criminal," went on Ned. "Often crooks call up on the telephone, but they know they are safe. The authorities can't see them—they can only hear them. Now if you could get a photograph of them while they were telephoning"

"I see!" cried Tom, excitedly. "That's great idea! I'll work on that, Ned."