They crossed the moving bands by an overhead bridge and cut down a narrow canyon to the entrance of a crosstown series of bands. They stepped onto the first band. The speed was moderate. From there they moved over to the second. Carruthers was in a hurry. He guided the girl and her brother across the third to the fourth band of moving steel.

Buildings slid past them like wraiths in the electric light. They felt no winter chill, for the streets and platforms were heated by a constant flow of warm air from slots ingeniously arranged in the band of swift moving metal upon which they stood. Within a few minutes they had arrived at their destination. Quickly they reversed their path across the moving bands until they reached the disembarking platform.

A short distance from the station they came to the entrance of a huge tower building.

Carruthers nodded to the doorman and they were admitted into a marble hallway. A silent, unattended lift bore them swiftly to the seventy-fifth floor. Down a deep carpeted hallway they moved.

Carruthers touched his door. It opened. He stood to one side as the other two entered.

Nanette cried with delight at the luxurious splendor of the place.

"Why, Aaron, I never dreamed the night view could be quite so delightful! I do believe that if the horrid government had not taken down that little Statue of Liberty and subst.i.tuted the Shaft Triumph in its place, that I could easily see her fingers clasping the torch she was reputed to hold.

"Progress, dear girl," shrugged Carruthers, holding out his hands for her cape. "By the way, have you folks eaten?"

"Not in a week," said Karl.

"Von Sternberger's food tablets," informed the girl.

Carruthers nodded. His deep-set eyes regarded them appraisingly. "Any ill effects?"

"None whatever," spoke Danzig. "Neither of us have the slightest craving for food."

"Good. Did you bring any with you?"

"A whole carton."

"Then I guess we're already to make the experiment. You're sure.

Nanette, that you're not afraid of...."

"Don't be silly, Aaron. I haven't grown up with Karl for nothing. He's always used me for the disagreeable end of his crazy experiments. And besides," she smiled on both men. "I have a woman's curiosity for the unknown."

"Very well," said Carruthers gravely. From his waistcoat pocket he took a ring of keys and inserted one of them into the lock of an immense steel door. "Our laboratory," he announced, swinging the door wide.

Nanette's eyes opened wide at the paneled whiteness of the room. Most of the far side was taken up with electrical machines, dynamos, generators and gla.s.s enclosed motors of an advanced type. Overhead, concealed lights made the room as light as day. A heavy gla.s.s railing shielded a square spot in the exact center of the room.

"What's that for?" asked the girl.

Danzig and Carruthers both regarded it with troubled eyes. It was Carruthers who spoke.

"That railing marks the spot where Professor Dahlgren stood when the rays of our atomic machine struck him."

"You mean," breathed the girl, "that he never moved from that spot after the rays touched his body? What happened?"

Karl had already divested himself of his coat and was checking the copper cables leading into a strange machine.

"It was rather curious," remarked Carruthers. "The moment the ray touched him his body began to dwindle. But evidently he suffered no pain. As a matter of fact his mind remained quite clear."

"How did you know?"

"As he dwindled in size," continued Carruthers, "he shouted warningly that the rays had become confused and for us to cut the switch. But the warning came a fraction of a second too late. Even as my fingers opened the contact, his body dwindled to a mere speck and disappeared entirely from sight."

Nanette gazed with staring eyes at the ill-fated spot. Her face had grown steadily paler. "Oh, Aaron! It's awful! What do you suppose happened?"

Carruthers eyes glowed strangely. "I didn't exactly know at the time, Nanette. I'm not sure that I know even now. But I've got a theory and Karl has helped me to build a second machine to flash a restoring ray on the square spot. What will take place I cannot even conjecture."

"Let's get on with the experiment," interrupted Karl. "Nanette can be shown later what she is to do."

Carruthers turned to Danzig. "All right. Karl. Draw up a chair to your machine. And you, Nanette, sit close to this switch. It's off now. To turn it on, simply push it forward until the copper plates slide into each other. To turn the current off, you pull sharply out. However, we aren't quite ready."

He shifted his position until he stood before a third machine slightly smaller than the other two. His fingers clicked a switch. The dial of the instrument glowed whitely.

"It's important," continued Carruthers, "that we first locate our interference. We have here, Nanette, a common television receiving apparatus capable of picking up news and pictures from any corner of the globe. Ready, Karl?"

Danzig clicked on the switch before his own machine and turned one of the many dials mounted on the panel in front of him. A faint hum filled the room as the generator settled to its task.

Carruthers reached up and dimmed the overhead lights. A screen of what looked like frosted gla.s.s set in the wall glowed luminously. The interior of a famous broadcasting studio became mirrored in the gla.s.s screen. Into it stepped the master of ceremonies. He spoke briefly of the New Year's activities that would soon take place when the twenty-eighth day of Jupiter ended at midnight.

"Boston," said Carruthers. "Too near."

"Try Frisco," suggested Karl. "The tubes ought to be sufficiently heated by this time."

The dial whirled beneath Carruthers slender fingers. The pictures framed in the frosted panel faded. Another took its place. San Francisco--an afternoon concert. Carruthers saw and listened for a moment, then moved thousands of miles out to sea.

Shanghai drifted into the panel, announcing in sing-song accents the weather reports. Following this came reports of various uprisings along the Manchurian border.

While yet the three listeners and watchers bent their heads toward the panel in the wall, a strange thing occurred. The silver frostiness of the screen became violently agitated with what looked like tiny sparks darting in and about each other like miniature solar systems.

Shanghai faded from the picture. All that remained visible now was the jumbled ma.s.s of needle-pointed sparks of luminosity.

"Careful," warned Carruthers. "Slow up the speed of your reflector, Karl. There, that's better. Watch the meter reading. I'm going to step up the power of the dimensional tubes. Steady!"

From an invisible reproducer came a sharp, metallic crackling like machine-gun bullets rattling on a tin roof. The sparks on the screen became violently agitated, pushing around in erratic circles and ellipses. They glowed constantly in shades of bright green through the blues into the deep violets of the color scale.

"What do you read?" asked Carruthers.

"Point seven six nine," answered Karl.

"Shift it back towards the blue, about two points lower on the scale."

Danzig twisted two dials at the same time with minute exactness.

"Point seven six eleven," he intoned.