Seeing this, the geologist deliberately reached out and scraped the dust from the nearest machine; and to the vast relief of all three, no damage was done. The dust fell straight to the floor, exposing a brilliantly polished streak of greenish-white metal.
Van Emmon made another tentative brush or so at other points, with the same result. Clean, untarnished metal lay beneath all that dust. Clearly it was some non-conducting alloy; whatever it was, it had successfully resisted the action of the elements all the while that such presumably wooden articles as the desk and railing had been steadily rotting.
Emboldened, Smith clambered up on the frame of one of the machines. He examined it closely as to its cams, clutches, gearing, and other details significant enough to his mechanical training. He noted their adjustments, scrutinized the conveying apparatus, and came back carrying a cylindrical object which he had removed from an automatic chuck.
"This is what they were making," he remarked, trying to conceal his excitement. The others brushed the dust from the thing, a huge piece of metal which would have been too much for their strength on the earth. Instantly they identified it.
It was a cannon shell.
Again Van Emmon led the way. They took a reassuring glance out the window at the familiar cube, then passed along the aisle toward the farther corner. As they neared it they saw that it contained a small enclosure of heavy metal scrollwork, within which stood a triangular elevator.
The men examined it as closely as possible, noting especially the extremely low stool which stood upon its platform. The same unerodable metal seemed to have been used throughout the whole affair.
After a careful scrutiny of the two levers which appeared to control the thing--"I'm going to try it out," announced Smith, well knowing that the others would have to go with him if they kept the telephones intact. They protested that the thing was not safe; Smith replied that they had seen no stairway, or anything corresponding to one. "If this lift is made of that alloy," admiringly, "then it's safe." But Jackson managed to talk him out of it.
When they returned to the heap of powdered wood which had been the desk, Smith spied a long work-bench under a nearby window. There they found a very ordinary vise, in which was clamped a piece of metal; but for the dust, it might have been placed there ten minutes before. On the bench lay several tools, some familiar to the engineer and some entirely strange. A set of screw-drivers of various sizes caught his eye. He picked them up, and again experienced the sensation of having wood turn to dust at his touch. The blades were whole.
Still searching, the engineer found a square metal chest of drawers, each of which he promptly opened. The contents were laden with dust, but he brushed this off and disclosed a quantity of exceedingly delicate instruments. They were more like dentists' tools than machinists', yet plainly were intended for mechanical use.
One drawer held what appeared to be a roll of drawings. Smith did not want to touch them; with infinite care he blew off the dust with the aid of his oxygen pipe. After a moment or two the surface was clear, but it offered no encouragement; it was the blank side of the paper.
There was no help for it. Smith grasped the roll firmly with his pliers --and next second gazed upon dust.
In the bottom drawer lay something that aroused the curiosity of all three. These were small reels, about two inches in diameter and a quarter of an inch thick, each incased in a tight-fitting box. They resembled measuring tapes to some extent, except that the ribbons were made of marvelously thin material. Van Emmon guessed that there were a hundred yards in a roll. Smith estimated it at three hundred. They seemed to be made of a metal similar to that composing the machines. Smith pocketed them all.
It was the builder who thought to look under the bench, but it was Smith who had brought a light. By its aid they discovered a very small machine, decidedly like a stock ticker, except that it had no glass dome, but possessed at one end a curious metal disk about a foot in diameter. Apparently it had been undergoing repairs; it was impossible to guess its purpose. Smith's pride was instantly aroused; he tucked it under his arm, and was impatient to get back to the cube, where he might more carefully examine his find with the tips of his fingers.
It was when they were about to leave the building that they thought to inspect walls and ceiling. Not that anything worth while was to be seen; the surfaces seemed perfectly plain and bare, except for the inevitable
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