you," said the young inventor, cordially. "Rather a queer place to meet a friend," he went on with a laugh and a glance down to the ground. "Can you climb?"

"Oh, yes, I'm used to that. The next thing will be to get my machine down."

"Oh, we can manage that with Koku's help," spoke Tom. "Koku, get some ropes, and see what you and Rad can do toward getting the aeroplane down," he added to the giant. "Let me know if you need any help."

"Me can do!" exclaimed the big man. "Me fix him!"

Tom and Mr. Halling made their way down the ladder, while the giant proceeded to study out a plan for getting the airship off the roof.

"You say you were coming over to see me, when you ran into my wireless aerials?" asked Tom, curiously, when he had introduced his father to the birdman.

"Yes," went on Mr. Halling. "I have been having some trouble with my motor, and I thought perhaps you could tell me what was wrong. My friend, Mr. Wakefield Damon, sent me to you."

"What! Do you know Mr. Damon?" cried Tom.

"I've known' him for some years. I met him in the West, but I hadn't seen him lately, until I came East. He sent me to see you, and said you would help me."

"Well, any friend of Mr. Damon's is a friend of mine!" exclaimed Tom, genially. "I'll have a look at your machine as soon as Koku gets it down. How is Mr. Damon, anyhow? I haven't seen him in over two weeks."

"I'm sorry to say he isn't very well, Mr. Swift."

"Is he ill? What is the trouble?"

"He isn't exactly ill," went on Mr. Halling, "but he is fretting himself into a sickness, worrying over his lost fortune."

"His lost fortune!" cried Tom, in surprise at the bad news concerning his friend. "I didn't know he had lost his money!"

"He hasn't yet, but he's in a fair way to, he says. It's something about bad investments, and he did speak of the trickery of one man, I didn't get the particulars. But he certainly feels very badly over it."

"I should think he would," put in Mr. Swift. "Tom, we must look into this. If we can help Mr. Damon--"

"We certainly will," interrupted Tom. "Now come in the house, Mr. Halling. I'm sure you must be quite shaken up by your upset."

"I am, to tell you the truth, though it isn't the first accident I've had in my airship."

They were proceeding toward the house, when there came a cry from Koku, who had fastened a rope about the airship to lower it.

"Master! Master!" cried the giant. "The rope am slippin'. Grab the end of it!"

Chapter III Tom's Failure

"Come on!" cried Tom, quickly, as, turning, he saw the accident about to happen. "Your craft will surely be smashed if she slips to the ground, Mr. Halling!"

"You're right! This seems to be my unlucky day!" The birdman, limping slightly from his fall, hurried with Tom to where a rope trailed on the ground. Koku had fastened one end to the airship, and had taken a turn of the cable about the chimney. He had been lowering the biplane to the ground, but he had not allowed for its great weight, and the rope had slipped from his big hands.

But Tom and Mr. Halling were just in time. They grabbed the slipping hempen strands, and thus checked the falling craft until Koku could get a better grip.

"All right now," said the giant, when he had made fast the rope. "Me fix now. Master can go."

"Think he can lower it?" asked Mr. Halling, doubtfully.

"Oh, surely," said Tom. "Koku's as strong as a horse. You needn't worry. He'll get it down all right. But you are limping."

"Yes, I jammed my leg a little."

"Don't you want a doctor?"

"Oh, no, not for a little thing like that."

But Tom insisted on looking at his new friend's wound, and found quite a cut on the thigh, which the young inventor insisted on binding up.

"That feels better," said the birdman, as he stretched out on a couch. "Now if you can look my machine over, and tell me what's the matter with it, I'll be much obliged to you, and I'll get on my way."

"Not quite so fast as that!" laughed Tom. "I wouldn't want to see you start off with your lame leg, and certainly I would not want to see you use your aircraft after what she's gone through, until we've given her a test. You can't tell what part you might have strained."

"Well, I suppose you are right. But I think I'd better go to a hotel, or send for an auto and go home."

"Now you needn't do anything of the kind," spoke Tom, hospitably. "We've got lots of room here, and for that matter we have plenty of autos and airships, too, as well as a motor boat. You just rest yourself here. Later we'll look over your craft."

After dinner, when Mr. Halling said he felt much better, Tom agreed to go out with him and look at the airship. As he feared, he found several things the matter with it, in addition to the motor trouble which had been the cause for Mr. Halling's call on the young inventor.

"Can she be fixed?" asked the birdman, who explained that, as yet, he was only an amateur in the practice of flying.

"Oh, yes, we can fix her up for you," said Tom. "But it will take several days. You'll have to leave it here."

"Well, I'll be glad to do that, for I know she will be all the better when you get through with her. But I think I am able to go on home now, and I really ought to. There is some business I must attend to."

"Speaking of business," remarked Tom, "can you tell me anything more of Mr. Damon's financial troubles?"

"No, not much. All I know is that when I called on him the other day I found him with his check book out, and he was doing a lot of figuring. He looked pretty blue and downcast, I can tell you."

"I'm sorry about that," spoke Tom, musingly. "Mr. Damon is a very good friend of mine, and I'd do anything to help him. I certainly wouldn't like to see him lose his fortune. Bad investments, you say it was?"

"Partly so, and yet I'm inclined to think if he does lose his money it will be due to some trickery. Mr. Damon is not the man to make bad investments by himself."

"Indeed he is not," agreed Tom. "You say he spoke of some man?"

"Yes, but not definitely. He did not mention any name. But Mr. Damon was certainly quite blue."

"That's unlike him," remarked Tom. "He is usually very jolly. He must be feeling quite badly. I'll go over and have a talk with him, as soon as I can."

"Do. I think he would appreciate it. And now I must see about getting home."

"I'll take you in one of my cars," said Tom, who had several automobiles. "I don't want to see you strain that injured leg of yours."

"You're very good--especially after I tangled up your wireless aerials; but I didn't see them until I was right into them," apologized Mr. Halling.

"They're a new kind of wire," said Tom, "and are not very plain to see. I must put up some warning signs. But don't worry about damaging them. They were only up temporarily anyhow, and I was going to take them down to arrange for my photo telephone."

"Photo telephone, eh? Is that something new?"

"It will be--if I can get it working," said Tom, with a smile.

A little later Tom had taken Mr. Halling home, and then he set about making arrangements for repairing the damaged airship. This took him the better part of a week, but he did not regret the time, for while he was working he was busy making plans for his newest invention--the photo telephone.

One afternoon, when Tom had completed the repairs to the airship, and had spent some time setting up an experimental telephone line, the young inventor received a call from his chum, Ned Newton.

"Well, well, what are you up to now?" asked Ned, as he saw his chum seated in a booth, with a telephone receiver to his ear, meanwhile looking steadily at a polished metal plate in front of him. "Trying to hypnotize yourself, Tom?"

"Not exactly. Quiet, Ned, please. I'm trying to listen."

Ned was too familiar with his chum's work to take offense at this. The