"You tell them, Sharm."
"I'm telling them. Old Sharm is going to get his cut of that good life, too."
THE SECRET OF STONEHENGE
Low clouds rushed by overhead in the dusk and there was a spattering of sleet in the air. When Dr. Lanning opened the cab door of the truck the wind pounced on him. Fresh from the Arctic, hurtling unimpeded across Salisbury Plain. He buried his chin in his collar and climbed down; Barker followed him out and tapped on the door of the office nearby. There was no answer.
"Not so good," Lanning said, opening the rear door of the truck and gently sliding the bulky wooden box down to the ground. "We don't leave our national monuments unguarded in the States."
"Really," Barker said, turning and striding to the gate in the wire fence. "Then I presume those initials carved in the base of the Washington Monument are neolithic graffiti. As you see I brought the key."
He unlocked the gate and threw it open with a squeal of unoiled hinges, then went to help Lanning with the case.
In the evening, under a lowering sky, that is the only way to see Stonehenge. Without the ice cream wrappers and clambering children. The Plain settles flat upon the earth, pressed outward to a distant horizon, and only the gray pillars of the sarsen stones have the strength to push up skyward.
Lanning led the way, bending into the wind, up the broad path of the Avenue.
"They're always bigger than you expect them to be," he said, and Barker did not answer him, perhaps because it was true. They stopped next to the Altar Stone and lowered the case. "We'll know soon enough," Lanning said, throwing open the latches.
"Another theory?" Barker asked, interested in spite of himself. "Our megaliths seem to hold a certain fascination for you and your fellow Americans."
"We tackle our problems wherever we find them," Lanning answered, opening the cover and disclosing a chunky and complicated piece of apparatus mounted on an aluminum tripod. "I have no theories at all about these things. I'm here just to find out the truth — why this thing was built."
"Admirable," Barker said, and the coolness of his comment was lost in the colder wind. "Might I ask just what this device is?"
"Chronostasis temporal-recorder." He opened the legs and stood the machine next to the Altar Stone. "My team at MIT worked it up. We found that temporal movement other than our usual twenty-four hours into the future every day— is instant death for anything living. At least we killed off roaches, rats, and chickens; there were no human volunteers. But inanimate objects can be moved without damage."
"Time travel?" Barker said in what he hoped was a diffident voice.
"Not really, time stasis would be a better description. The machine stands still and lets everything else move by it. We've penetrated a good ten thousand years into the past this way."
"If the machine stands still that means that time is running backwards?"
"Perhaps it is — would you be able to tell the difference? Here, I think we're ready to go now."
Lanning adjusted the controls on the side of the machine, pressed a stud, then stepped back. A rapid whirring came from the depths of the device: Barker raised one quizzical eyebrow.
"A timer," Lanning explained. "It's not safe to be close to the thing when it's operating."
The whirring ceased and was followed by a sharp click, immediately after which the entire apparatus vanished.
"This won't take long," Lanning said, and the machine reappeared even as he spoke. A glossy photograph dropped from a slot into his hand when he touched the back. He showed it to Barker.
"Just a trial run. I sent it back twenty minutes." Although the camera had been pointing at them, the two men were not in the picture. Instead, in darkish pastels due to the failing light, the photograph showed a view down the Avenue, with their parked truck just a tiny square in the distance. From the rear doors of the vehicle the two men could be seen removing the yellow box.
"That's very. impressive," Barker said, shocked into admission of the truth. "How far back can you send it?"
"Seems to be no limit, just depends on the power source. This model has nicad batteries and is good back to about ten thousand B.C."
"And the future?"
"A closed book, I'm afraid. But we may lick that problem yet." He extracted a small notebook from his hip pocket and consulted it, then set the dials once again.
"These are the optimum dates, about the time we figure Stonehenge was built. I'm making this a multiple-shot. This lever records the setting, so now I can feed in another one."
There were over twenty settings to be made, which necessitated a great deal of dial spinning. When it was finally done, Lanning actuated the timer and went to join Barker.
This time the departure of the chronostasis temporal-recorder was much more dramatic. It vanished readily enough, but left a glowing replica of itself behind, a shimmering golden outline easily visible in the growing darkness.
"Is that normal?" Barker asked.
"Yes, but only on the big time jumps. No one is really sure just what it is, but we call it a temporal echo. The current theory that it is sort of a resonance in time caused by the sudden departure of the machine. It fades away in a couple of minutes."
Before the golden glow was completely gone the device itself returned, appearing solidly in place of its spectral echo. Lanning rubbed his hands together, then pressed the print button. The machine clattered in response and extruded a long strip of connected prints.
"Not as good as I expected," Lanning said. "We hit the daytime all right, but there is nothing much going on."
There was enough going on to almost stop Barker's ar-cheologist heart. Picture after picture of the megalith standing strong and complete, the menhirs upright and the lintels in place upon all the sarsen stones.
"Lots of rock," Lanning said, "but no sign of the people who built the thing. Looks like the dating theories are wrong. Do you have any idea when it was put up?"
"Sir J. Norman Lockyer believed that it was erected on June 24th, 1680 B.C.," he said abstractedly, still petrified by the photographs.
"Sounds good to me."
The dials were spun and the machine vanished once again. The picture this time was far more dramatic. A group of men in rough homespun genuflected, arms outstretched, facing toward the camera.
"We've got it now," Lanning chortled, and spun the machine about in a half circle so it faced in the opposite direction. "Whatever they're worshiping is behind the camera. I'll take a shot of it and we'll have a good idea why they built this thing."
The second picture was almost identical to the first, as were two more taken at right angles to the first ones.
"This is crazy," Lanning said, "they're all facing into the camera and bowing. Why, the machine must be sitting on top of whatever they are looking at."
"No, the angle proves that the tripod is on the same level that they are." Sudden realization hit Barker and his jaw sagged. "Is it possible that your temporal echo could be visible in the past as well?"
"Well… I don't see why not. Do you mean.?"
"Correct. The golden glow of the machine caused by all those stops must have been visible on and off for years. It gave me a jolt when I first saw it and it must have been much more impressive to the people then."
"It fits," Lanning said, smiling happily and beginning to repack the machine. "They built Stonehenge around the image of the device sent back to see why they built Stonehenge. That's one problem solved."
"Solved! The problem has just begun. It's a paradox. Which of them, the machine or the monument, came first?"