LITMIR.BIZ

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he was furtively watching the face of Kennedy as though he hoped to learn as much from him as Craig did on his part.

      "It's the mechanical end of it that I don't understand," continued Tresham, after a pause. "Creighton claims to have discovered a new force which he calls vibrodyne. I think it is just as well that Miss Laidlaw has decided to consult a scientist about it before she puts any more money into the thing. I can't say I approve of her interest in it—though, of course, I know next to nothing about it, except from the legal standpoint."

      "Who is that Mrs. Barry of whom Miss Laidlaw spoke?" asked Kennedy a moment later.

      "I believe she is a friend of Creighton's. Somehow she got acquainted with Miss Laidlaw and introduced her to him."

      "You know her?" queried Craig casually.

      "Oh, yes," came the frank reply. "She has been in to see me, too; first to interest me in the motor, and then to consult me about various legal points in connection with it."

      I felt sure that Tresham was more than just a bit jealous of his pretty client. Certainly his tone was intended to convey the impression that he wished she would leave her affairs in his hands entirely.

      "You don't know anything more about her—where she came from—her connections?" added Craig.

      "Hardly more than you do," asserted Tresham. "I've only seen the woman a few times. In fact I should be glad to know more about her—and about Creighton, too. I hope that if you find out anything you'll let me know so that I can protect Miss Laidlaw's interests."

      "I shall do so," promised Kennedy, rising.

      "I'll do the same," agreed Tresham, extending his hand. "I see no reason why we shouldn't work together for—my client."

      There was no mistaking the fact that Tresham would have liked to be able to say something more intimate than "client." Perhaps he might have been nearer to it if her interest in him had not been diverted by this wonderful motor. At any rate I fancied he had little love for Creighton. Yet, when I reflected afterward, it seemed like a wide gulf that must separate a comparatively impecunious lawyer from a wealthy girl like Adele Laidlaw.

      Kennedy was not through with his effort to learn something by a thorough investigation of the neighborhood yet. For some time after we left Tresham's office, he stood in the doorway of the Bank Building, looking about as though he hated to leave without establishing some vantage point from which to watch what was going on in Creighton's laboratory.

      "Of course I can't very well get into the safety vault under the bank," he mused. "I wish I could."

      He walked past Creighton's without seeing anything happen. The next building was a similar two-story brick affair. A sign on it read, "Studios and Offices For Rent."

      An idea seemed to be suggested to him by the sign. He wheeled and entered the place. Inquiry brought out a caretaker who showed us several rooms unoccupied, among them one vacant on the first floor.

      Kennedy looked it over carefully, as though considering whether it was just the place he wanted, but ended, as I knew he intended, in hiring it.

      "I can't move my stuff in for a couple of days," he told the caretaker. "Meanwhile, I may have the key, I suppose?"

      He had paid a good deposit and the key was readily forthcoming.

      The hiring of the ground floor room accomplished without exciting suspicion, Kennedy and I made a hasty trip up to his own laboratory, where he took a small box from a cabinet and hurried back to the taxicab which had brought us uptown.

      Back again in the bare room which he had acquired, Craig set to work immediately installing a peculiar instrument which he took from the package.

      It seemed to consist of two rods much like electric light carbons, fixed horizontally in a wooden support with a spindle-shaped bit of carbon between the two ends of the rods. Wires were connected with binding screws at the free ends of the carbon rods.

      First Craig made a connection with an electric light socket from which he removed the bulb, cutting in a rheostat. Then he attached the free wires from the carbons to a sort of telephone headgear and switched on the current.

      "What is it?" I asked curiously.

      "A geophone," he replied simply.

      "And what is a geophone?" I inquired.

      "Literally an earth-phone," he explained. "It is really the simplest form of telephone, applied to the earth. You saw what it was. Any high school student of physics can make one, even with two or three dry batteries in circuit."

      "But what does it do?" I asked.

      "It is really designed to detect earth vibrations. All that is necessary is to set the carbon stick arrangement, which is the transmitter of this telephone, on the floor, place myself at the other end and listen. A trained ear can readily detect rumblings. Really it is doing in a different and often better way what the seismograph does. This instrument is so sensitive that it will record the slamming of a cellar door across the street. No one can go up those stairs next door without letting me know it, no matter how cautious he is about it."

      Craig stood there some minutes holding the thing over his ears and listening intently.

      "The vibrodyne machine isn't running," he remarked finally after repeated adjustments of the geophone. "But someone is in that little room under Creighton's workshop. I suspected that something was down there after that watch crystal test of mine. Now I know it. I wonder what the man is doing?"

      There was no excuse yet, however, for breaking into the room on the other side of the wall and under Creighton's. Kennedy went out and watched. Though we waited some time nobody came out. He went back to our own room in the rear of the first floor. Though we both listened some time, neither of us could now hear a sound through the geophone except those made by passing trolleys and street vehicles.

      Inquiry about the neighborhood did not develop who was the tenant or what was his business. In fact the results were just the reverse. No one seemed to know even the business conducted there. The room back of the locked door which Miss Laidlaw had passed was shrouded in mystery.

      Nothing at all of any value was being recorded by the geophone when Kennedy glanced quickly at his watch. "If we are to see Miss Laidlaw and meet that Mrs. Barry, we had better be on our way," he remarked hurriedly.

      Miss Laidlaw was living in a handsome apartment on Central Park, West. We entered and gave our cards to the man at the door of her suite, who bowed us into a little reception room. We entered and waited.

      Suddenly we were aware that someone in the next room, a library, was talking. Whether we would or not we could not help overhearing what was said. Apparently two women were there, and they were not taking care how loud they spoke.

      "Then you object to my even knowing Mr. Creighton?" asked one of the voices, pausing evidently for a reply which the other did not choose to make. "I suppose if it was Mr. Tresham you'd object, too."

      There was something "catty" and taunting about the voice. It was a hard voice, the voice of a woman who had seen much, and felt fully capable of taking care of herself in more.

      "You can't make up your mind which one you care for most, then? Is that it?" pursued the same voice. "Well, I'll be a sport. I'll leave you Creighton—if you can keep him."

      "I want neither," broke in a voice which I recognized at once as Adele Laidlaw's.

      She spoke with a suppressed emotion which plainly indicated that she did want one of them.

      Just then the butler entered with our cards. We heard no more. A moment later we were ushered into the library.

      Mrs. Barry was a trim, well-groomed woman whose age was deceptive. I felt that no matter what one might think of Miss Laidlaw, here was a woman whose very looks seemed to warn one to be on his guard. She was a woman of the world, confident in her own ability to take care of herself.

      Adele was flushed and excited, as we entered, though she was making a desperate

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