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my father calling!"

"Hmmm." Ames frowned. "What about background noises?"

Tom thought hard. "None. If I had detected any special sounds during the call, I'm sure they would have stuck in my mind."

Ames tried another tack. He asked how many people had known about the expected arrival of the brain energy from space. This was harder to answer, but as Tom and his father enumerated the persons, it did help to narrow the circle of suspects.

Besides the Swifts, Chow, Phyl, Ames, and George Dilling, there were three groups who had had access to the information. One was the radio operators at the space-communications laboratory. Another consisted of Arv Hanson and Hank Sterling and the workmen who had taken part in building the energy container. The last group, which also included Hank and Arv, were the technicians who had actually gone to the hillside to await the visitor from Planet X.

Tom scowled. "None of those people would pull such a trick, Harlanβ€”any more than the ones like you and Arv and Hank who are above suspicion. Most of them could have easily obtained the news without going through such a rigmarole."

Mr. Swift nodded. "Tom's right. Unless, of course, they had some urgent reason for wanting to find out as soon as possible."

"Which makes me think it may have been an outsider after all," Tom argued. "Remember, the Brungarians may have intercepted the code messages to or from our space friends." After a moment's silence, he added gloomily, "Whoever the caller was, he knew the energy was arriving. And now he knows it's here!"

Bud interjected, "Well, if he was a Brungarian agent and he's hoping to steal the brain energy, one thing's sure. No earthquake will demolish this place as long as the energy is here at Enterprises."

"A comforting thought, Bud," Mr. Swift commented with a wry smile.

Again Tom frowned. "At any rate, Harlan, see if you can get a line on that impostor."

Ames departed to begin a thorough check of all personnel at the plant who might have been implicated. Bud went on an errand, as Tom began showing his father the accomplishments of the space robot.

"We've christened him Exman," Tom said.

By means of the electronic brain, he made the visitor do a number of maneuvers in response to orders.

"Wonderful!" Mr. Swift exclaimed, greatly impressed. "Let's see if he can use his caterpillar treads as well as he does the wheels."

Tom brought a small flight of portable aluminum stairs which he used for reaching up on high shelves or tinkering with outsized machines. Tom was uncertain at first how to code the command, having no symbol for steps or stairs. Finally he moved Exman to the bottom of the steps and signaled simply: Go up!

Exman paused for a moment, then attempted the ascent. His caterpillar tracks clawed their way up the first step. Then, gingerly, he essayed the next. The robot body tilted, but its gyro kept it from toppling over.

"Bravo!" Mr. Swift applauded encouragingly. But the next instant Exman gave up! He slid back to the floor again with a heavy bump. Then he began whirling and darting about madly.

"Good night! Exman's gone berserk!" Tom cried.

Now wafts of smoke could be seen issuing from the robot's wheels. He was banging wildly about the laboratory, leaving a trail of havoc.

Bud, who had returned, opened the door to come in. Instantly Exman lunged toward him, antennas sparking fiercely and wheels smoking. Bud slammed the door hastily.

The Swifts, too, found it wiser to take cover. They crouched behind a lab workbench until the frenzy was over. Presently Exman subsided and rolled to a complete standstill.

"Good grief!" Tom stood up cautiously and eyed the creature. It made no further move. Bud poked his head through the doorway for a wary look, then re-entered the laboratory.

"What made him blow his top?" Bud asked.

Then Tom heard a quiet chuckle from his father. "Actually, boys," the elder scientist said, "I think we should be encouraged."

(Tom Jr. and Tom Sr. watch as Exman tries to climb stairs) "Encouraged?" Tom stared at his father.

Mr. Swift nodded. "Yes, the whole thing was rather a noteworthy reaction. I believe Exman was displaying a fear complex about navigating up those stairs."

Tom gasped, then broke out laughing. "Dad, you're right! I'll bet when its body tilted over, the brain wasn't sure whether the gyro would keep it from being wrecked. It just shows Ole Think Box is getting more human all the time!"

Bud ventured to pat Exman on its "back." "Relax, kid," he said with a chuckle. "You're among friends and we wouldn't dream of letting you get hurt. You're too valuable!"

Mr. Swift stroked his jaw thoughtfully. "Valuable, yes, if we can only get it to communicate. Tom, I believe the first project we should work on is a way to make Exman talk."

After the debris had been cleaned up, the two scientists pulled up stools to the workbench and began to discuss the problem. Bud, seeing them absorbed, and realizing the discussion would soon be far beyond his depth, snapped a grinning salute at Exman and quietly left the laboratory.

"Dad, the toughest part won't be the speech mechanism itself," Tom pointed out. "There are several ways we could handle thatβ€”by modulating a column of air, for instance, or by some sort of speaker diaphragm. The real stumper will be how to teach him our spoken language."

Mr. Swift nodded. "I'm afraid you're right. If the inhabitants of Planet X communicate telepathically, or by some sort of wave transfer, they may have long since forgotten any concept of a spoken language."

The Swifts batted several ideas back and forth. Then Tom snapped his fingers.

"Wait, Dad! We have the answer! The electronic brain!"

Mr. Swift's eyes lighted up. "Of course! The machine already translates the space code into written English. All we need do is add a device to convert the machine's impulses into sound!"

In two hours the Swifts had put together a mechanism designed to work through a tape recorder. This was hooked up to the electronic brain.

After recording for several moments, Tom reversed the tape and switched on the playback. A squeaky jumble of noises could be heard. But one word seemed to come through fairly distinctly. "Universe!"

"It's talking!" Tom cried out.

"Trying to, but not succeeding very well," Mr. Swift said.

Nevertheless, the two scientists were jubilant at this first breakthrough. Eagerly they began making adjustmentsβ€”both on the electronic-brain hookup and the converter mechanism. Tom was just about to switch on the tape recorder again when the telephone rang.

The young inventor was annoyed at being interrupted at such a crucial moment, but picked up the phone. "Tom Swift Jr. speaking."

"You have an urgent call from Washington," the operator informed him. "Just a moment, please."

Bernt Ahlgren was calling from the Pentagon. The defense expert's voice was strained.

"Tom, there's just been another attempt to cause an earthquake here in Washington!"

Tom gasped. "What happened?"

"It failed, thanks to you. But Intelligence believes an attempt will be made on New York City very soon. We need your help to stop it. How near completion are the other shock deflectors?"

Before Tom could answer, he heard excited voices at the other end of the line. Then Ahlgren broke in again abruptly.

"A news flash, Tom! The Walling range-finder plant has been demolished by an earthquake!"

CHAPTER XIV AIR-BORNE HIJACKERS

Mr. Swift, hearing Tom's dismayed reaction, rushed to the telephone.

"What's wrong, son?"

Tom clamped his hand over the mouthpiece and quickly gave his father the news of the destroyed range-finder plant. Then he spoke into the telephone.

"Bernt, we must prevent another disaster! Let me check with our construction company on the Quakelizors and I'll call you right back!"

"Right, Tom," Ahlgren agreed.

Both Tom and Mr. Swift were shocked by this latest blow of their enemies. Tom called Ned Newton at the Swift Construction Company at once and told him the news.

"How soon will the Quakelizors be ready, Uncle Ned?"

"They're finished, Tom. We're running a final inspection on them right now. We can have them ready to ship out by one o'clock."

Tom relayed word to the Pentagon. Bernt Ahlgren was greatly relieved. "By the way," Tom went on, "what about the sites? Have they been chosen yet?"

"Only tentatively," Ahlgren replied. "We wanted to get your opinion first."

One of the deflectors, Ahlgren felt, should be based in position to guard the New York and New England area, in view of Intelligence warnings about a probable attack on New York City. Another, in the Cumberland plateau region of Kentucky, could damp out shock waves threatening either the heavily industrialized Great Lakes area or any southern city.

As to the other three Quakelizors, Ahlgren suggested that one be installed on the West Coast, one in the Black Hills of South Dakota, and the third on the Atlantic island of San Rosario. This would protect both Latin-American allies and Caribbean defense bases of the United States.

Before deciding, Tom asked that Dr. Miles at the Bureau of Mines be circuited into the telephone conversation. Mr. Swift, too, joined in on another line. The four scientists discussed the problem and referred to geologic maps. Finally the exact sites were agreed upon.

"Dad, I'm going to deliver and install one of those Quakelizors myself," Tom declared, after the telephone conference ended. "Judging from that phone impostor last night, there's no telling what sort of trick our enemies may try next!"

Mr. Swift approved heartily. "Good idea, son. In the meantime, I'll see what I can accomplish with Ole Think Box here."

Tom notified Uncle Ned of the delivery sites. He requested that because of the urgency of the situation, Swift planes transport the Quakelizors. Mr. Newton promised to have five cargo jets loaded and prepared for take-off from the construction company airfield.

Next, Tom turned to the job of rounding up flight crews. He decided that Hank Sterling, Arv Hanson, Art Wiltessa, and a crack Swift test pilot, Slim Davis, would each captain a plane.

Tom was just hanging up the telephone when Chow wheeled in a lunch cart, bearing sizzling servings of steak for the two Swifts.

"How's Ole Think Box comin' along?" Chow inquired.

"All right now, but he went berserk a while back," Tom replied with a chuckle.

Chow eyed the robot apprehensively and made a hasty exit. Both Tom Jr. and Tom Sr. were amused.

As they ate, the two scientists continued their discussion on how to equip Exman with senses and the power of speech. Several minutes later, when they were finishing dessert, Bud came into the laboratory.

"Tom, what's this about you hopping off somewhere to install a Quakelizor?" he asked anxiously.

"Don't worry, pal. I'll need my usual copilot," Tom said with a grin. "Just didn't have time to call you before lunch. We'll be flying down to a place called San Rosario in the Caribbean."

At one o'clock Tom briefed the flight crews and technicians. Slim was provided with three men who had worked on the original model of the quake deflector. After making sure that every man knew his job, Tom had the groups flown by helicopter over to the Swift Construction Company airfield.

Tom and Bud's cargo jet was the second to take off. On signal from the tower, the big workhorse thundered down the runway and soared off into the blue. Soon it was spearing southward above the waters of the Atlantic.

Presently Bud drew Tom's attention to some blurry specks of light on the radarscope. "Looks like a formation of planes, skipper."

Tom studied the blips for a while. "Guess you're right. It's sure not a flock of sea gulls!" The young inventor frowned.

"Worried, Tom?" Bud asked quietly.

Tom shrugged. "It could be a routine military flight."

He increased speed and climbed for altitude. But the blips on the

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