erator surrounded and covered. The doctor jerked the phones from his head, and said:
"Hands up, Mr. Hegel. You are under arrest."
His look of surprise and alarm was quickly followed by a sullen frown as he thrust his pudgy hands aloft.
"Arrest? For what?" he demanded belligerently.
"Nivver mind for what, my old buckaroo," said Hogan, snapping the handcuffs on his wrists. "I've a warrant in me pocket that covers ivverything from interferin' wid the radio reception on the north shore down to attempted murder. Come away wid yez now, and don't try no shenanigans, or be the lord Harry, I'll quiet yez wid this gun butt." . . . . .
SOME two hours later, having left Hegel in the care of the proper authorities, we were gathered in the living room of the Van Loan home—the girl, the two engineers, the two detectives, Dr. Dorp, and I. All were seated but the doctor, who stood before the fireplace. He cleared his throat and looked around with his well known lecture-room air.
"Now that the author of the strange phenomena which have confronted us in this house has been apprehended," he said, "explanations, and such further investigations as are needed to completely clear up the mystery, are in order.
"You are all aware that the manifestations we have witnessed were under the control of an operator established in an old farm house eight miles west of here, and that the mechanism he used was a powerful and complicated radio set. In order that you may thoroughly understand how Ernest Hegel was able to make inanimate objects react to our movements as if they were endowed with minds, let me explain that he could both see and hear what was going on in this house as well as if he had been here in person. Planted in this very room in such a clever manner as to escape notice except by the most careful scrutiny, are powerful lenses which acted as his eyes, and microphones which served as his distance ears. If Miss Van Loan does not mind a slight mutilation of her walls in the interests of our investigation, I will disclose one of each."
"I should like to see them, doctor," said Miss Van Loan.
The doctor took out his pocket knife and opened it. Then he walked to the wall opposite us and scrutinized it very carefully. Presently he held the point of the knife to a small spot which resembled thousands of other spots on the mottled pattern of the wall paper, and said:
"Can you see this opening?"
We all replied that we could not, and crowded around him. As we drew close to it a small hole about the diameter of a lead pencil became visible by concentration on the spot touched by the knife. Unless we had been deliberately searching for it, it is probable that it would have gone entirely unnoticed, due to its location on one of the dark spots in the pattern of the paper itself.
"This," said the doctor, "is one of Hegel's eyes." He lightly tapped inside the hole with the point of his knife and we heard it click against some hard substance. Then he cut a square of paper and plastering from around it, disclosing a black box which bore a close resemblance to a small camera with a tiny lens in front. Taking a small screw driver from his pocket, he removed the front of the box, the back of which was covered with row on row of small, circular affairs which he described as photo-electric cells.
"Each cell," he said, "responds, according to the strength of light or shade which strikes it through the lens, with a different wave length. These various wave lengths are combined and transmitted from a common antenna. At the receiving station, the process is reversed, and this image is built up on ground glass by various vibrating light beams. For a thorough description of this process, which I will not go into here, I refer you to the book, "Radio for All." There are four "eyes" like this one in this room alone. Every other room in this house is as thoroughly equipped.
"And now for the ears."
He examined the wall until he found another hole, into which he thrust the knife blade. Then he removed another square of wall paper and plaster, revealing one of those instruments with which we were all familiar—the microphone.
"As this instrument needs no explanation," he said, "I will now show you how our friend Hegel managed to lock, unlock, open and close doors from a distance of eight miles."
He walked to the door and opened it.
"This door," he said, "shows no signs of having been tampered with in any way, yet I am convinced that there are at least two electric wires connecting it with the current which Hegel tapped somewhere in front of the meter—I have not yet discovered where."
With his screw driver, he removed the bottom hinge, while we crowded around him. Then he started tp remove the top hinge, but found that the first screw he tried would not turn. Abandoning it, he removed all the other screws, then inserted the screw driver beneath the hinge, and pried. The hinge came loose, but revealed the fact that the screw had been soldered to the metal back, and to a heavy wire which now protruded from the wall. The whole thing had been insulated with electricians' tape, and the block of wood in which it was fastened had been cut out, surrounded with sealing wax, and replaced. He next removed the other side of the hinge from the door, and found it similarly connected and insulated, the wire leading to the interior of the door.
Having cut the wire with a pair of pliers, the doctor laid the door on its side and removed the lock and latch. Both were controlled by an ingenious arrangement of electro-magnets. The return current, he found, was through roundheaded, insulated contact screws, one on the door, and one on the door jamb against which it fitted.
He next turned his attention to the bottom of the door. It was evident at a glance, that a long strip of wood had been removed, replaced with glue, sanded and varnished. Using his screw driver as a chisel, he
