surrounded with trees and shrubbery, which served somewhat to screen them. We came at last to the Willoughby house, a sizable colonial residence set up on a hill. It was dark, except for one dim light in an upper story. In the shadow of the hedge, Craig silently vaulted the low fence and slipped up the terraces, as noiselessly as an Indian, scarcely crackling a twig or rustling a dead leaf on the ground. He paused as he came to a wing on the right of the house.
I had followed more laboriously, carrying the box and noting that he was not looking so much at the house as at the sky, apparently. It did not take long to fathom what he was after. It was not a star-gazing expedition; he was following the telephone wire that ran in from the street to the corner of the house near which we were now standing. A moment's inspection showed him where the wire was led down on the outside and entered through the top of a window.
Quickly he worked, though in a rather awkward position, attaching two wires carefully to the telephone wires. Next he relieved me of the oak box with its strange contents, and placed it under the porch where it was completely hidden by some lattice-work which extended down to the ground on this side. Then he attached the new wires from the telephone to it and hid the connecting wires as best he could behind the swaying runners of a vine. At last, when he had finished to his satisfaction, we retraced our steps, to find that our only chance of getting out of town that night was by trolley that landed us, after many changes, in our apartment in New York, thoroughly convinced of the disadvantages of suburban detective work.
Nevertheless the next day found us out sleuthing about Glenclair, this time in a more pleasant rôle. We had a newspaper friend or two out there who was willing to introduce us about without asking too many questions, Kennedy, of course, insisted on beginning at the very headquarters of gossip, the country club.
We spent several enjoyable hours about the town, picking up a good deal of miscellaneous and useless information. It was, however, as Kennedy had suspected. Annie Grayson had taken up her residence in an artistic little house on one of the best side streets of the town. But her name was no longer Annie Grayson. She was Mrs. Maud Emery, a dashing young widow of some means, living in a very quiet but altogether comfortable style, cutting quite a figure in the exclusive suburban community, a leading member of the church circle, an officer of the Civic League, prominent in the women's club, and popular with those to whom the established order of things was so perfect that the only new bulwark of their rights was an anti-suffrage society. In fact, every one was talking of the valuable social acquisition in the person of this attractive young woman who entertained lavishly and was bracing up an otherwise drooping season. No one knew much about her, but then, that was not necessary. It was enough to accept one whose opinions and actions were not subversive of the social order in any way.
The Willoughbys, of course, were among the most prominent people in the town. William Willoughby was head of the firm of Willoughby & Walton, and it was the general opinion that Mrs. Willoughby was the head of the firm of Ella & William Willoughby. The Willoughbys were good mixers, and were spoken well of even by the set who occupied the social stratum just one degree below that in which they themselves moved. In fact, when Mrs. Willoughby had been severely injured in an automobile accident during the previous summer Glenclair had shown real solicitude for her and had forgotten a good deal of its artificiality in genuine human interest.
Kennedy was impatiently waiting for an opportunity to recover the box which he had left under the Willoughby porch. Several times we walked past the house, but it was not until nightfall that he considered it wise to make the recovery. Again we slipped silently up the terraces. It was the work of only a moment to cut the wires, and in triumph Craig bore off the precious oak box and its batteries.
He said little on our journey back to the city, but the moment we had reached the laboratory he set the box on a table with an attachment which seemed to be controlled by pedals operated by the feet.
"Walter," he explained, holding what looked like an earpiece in his hand, "this is another of those new little instruments that scientific detectives to-day are using. A poet might write a clever little verse titled, 'The telegraphone'll get you, if you don't watch, out.' This is the latest improved telegraphone, a little electromagnetic wizard in a box, which we detectives are now using to take down and 'can' telephone conversations and other records. It is based on an entirely new principle in every way different from the phonograph. It was discovered by an inventor several years ago, while experimenting in telephony.
"There are no disks or cylinders of wax, as in the phonograph, but two large spools of extremely fine steel wire. The record is not made mechanically on a cylinder, but electromagnetically on this wire. Small portions of magnetism are imparted to fractions of the steel wire as it passes between two carbon electric magnets. Each impression represents a sound wave. There is no apparent difference in the wire, no surface abrasion or other change, yet each particle of steel undergoes an electromagnetic transformation by which the sound is indelibly imprinted on it until it is wiped out by the erasing magnet. There are no cylinders to be shaved; all that is needed to use the wire again is to pass a magnet over it, automatically erasing any previous record that you do not wish to preserve. You can dictate into it, or, with this plug in, you can record a telephone conversation on it. Even rust or other deterioration of the steel wire by time will not affect this electromagnetic registry of sound. It can be read as long as steel will last. It is as effective for long distances as for short, and there is wire enough on one of these spools for thirty minutes of uninterrupted record."
Craig continued to tinker tantalisingly with the machine.
"The principle on which it is based," he added, "is that a mass of tempered steel may be impressed with and will retain magnetic fluxes varying in density and in sign in adjacent portions of its mass. There are no indentations on the wire or the steel disk. Instead there is a deposit of magnetic impulse on the wire, which is made by connecting up an ordinary telephone transmitter with the electromagnets and talking through the coil. The disturbance set up in the coils by the vibration of the diaphragm of the transmitter causes a deposit of magnetic impulse on the wire, the coils being connected with dry batteries. When the wire is again run past these coils, with a receiver such as I have here in circuit with the coils, a light vibration is set up in the receiver diaphragm which reproduces the sound of speech."
He turned a switch and placed an ear-piece over his head, giving me another connected with it. We listened eagerly. There were no foreign noises in the machine, no grating or thumping sounds, as he controlled the running off of the steel wire by means of a foot-pedal.
We were listening to everything that had been said over the Willoughby telephone during the day. Several local calls to tradesmen came first, and these we passed over quickly. Finally we heard the following conversation:
"Hello. Is that you, Ella? Yes, this is Maud. Good-morning. How do you feel to-day?"
"Good-morning, Maud. I don't feel very well. I have a splitting headache."
"Oh, that's too bad, dear. What are you doing for it?"
"Nothing—yet. If it doesn't get better I shall have Mr. Willoughby call up Dr. Guthrie."
"Oh, I hope it gets better soon. You poor creature, don't you think a little trip into town might make you feel better? Had you thought of going to-day?"
"Why, no. I hadn't thought of going in. Are you going?"
"Did you see the Trimble ad. in the morning paper?"
"No, I didn't see the papers this morning. My head felt too bad."
"Well, just glance at it. It will interest you. They have the Kimberley Queen, the great new South African diamond on exhibition there."
"They have? I never heard of it before, but isn't that interesting. I certainly would like to see it. Have you ever seen it?"
"No, but I have made up my mind not to miss a sight of it. They say it is wonderful. You'd better come along. I may have something interesting to tell you, too."
"Well, I believe I will go. Thank you, Maud, for suggesting it. Perhaps the little change will make me feel better. What train are you going to take? The ten-two? All right, I'll try to meet you at the station. Good-bye, Maud."
"Good-bye,