"Tom, is there any limit to what you're going to do?" asked Ned, admiringly.
"Oh, yes, I'm going to stop soon, and retire," laughed the young inventor.
After talking the matter over, Tom and his chum decided to wait a day or so before taking any action in regard to the button clew to the takers of the airship. After all, no great harm had been done, and Tom was more anxious to locate Mr. Damon, and try to get back his fortune, as well as to perfect his photo telephone, than he was to discover those who had helped themselves to the Eagle.
Tom and Ned put in some busy days, arranging the phonograph attachment. It was easy, compared to the hard work of sending a picture over the wire. They paid several visits to Mrs. Damon, but she had no news of her missing husband, and, as the days went by, she suffered more and more under the strain.
Finally Tom's new invention was fully completed. It was a great success, and he not only secured pictures of Ned and others over the wire, as he talked to them, but he imprinted on wax cylinders, to be reproduced later, the very things they said.
It was a day or so after he had demonstrated his new attachment for the first time, that Tom received a most urgent message from Mrs. Damon.
"Tom," she said, over the telephone, "I wish you would call. Something very mysterious has happened."
"Mr. Damon hasn't come back; has he?" asked Tom eagerly.
"No--but I wish I could say he had. This concerns him, however. Can you come?"
"I'll be there right away."