"The expeditionary force of the Master Intelligence of Mars," he thought, "preparing to set out against humanity! And what I can do is the only chance to stop it!"
e climbed again with renewed energy. A few yards more brought him to the colossal metal ring. Resting upon the three towers, it was a circular band of shining metal a foot thick and as wide as a road. The intense purple glow extended several feet from its surface.
Dan touched it tentatively. He felt a tingling electric shock. And he thought he could feel a radiation coming from it, giving him a curious sensation of cold. As he reached his hands up and grasped the upper edge of the great ring, he felt what seemed a physical current of cold.
Controlling his tendency to shiver, he climbed upon the last brace, and, lifting his weight with his hands, threw himself face down upon the flat upper surface of the vast ring. He lay bathed in cold purple fire. He tingled with the chill of it. A frozen current seemed to penetrate his body. Involuntarily he trembled, lost his grip and dangled precariously from the rim.
Only a frantic scrambling restored his hold. Then, fighting the sensation of freezing cold that came from the mist of purple flame, he drew himself forward and got to his feet upon the broad surface of the metal ring. On both sides it curved away like a circular track. Red-violet fire shimmered about it, bathing him to the waist in a chilling torrent.
Through coruscating frozen flame he waded to the inner rim of the colossal ring. Below him hung the needle, a mere straight line of white fire, a hundred feet in length. Eye-dazzling radiance scintillated along it, waxing and waning with a curious throbbing rhythm. The needle vibrated a little, but it pointed directly at the red point of Mars, now almost directly overhead.
Repressing a shudder, Dan looked down at the complex and delicate apparatus upon which the slender needle was mounted. It was a light frame of white metal bars, with spidery coils and huge glowing tubes and flimsy spinning disks mounted in it. The gleaming needle was mounted much like a telescope at the top of the device, fully fifty feet below him.
"Looks flimsy enough," Dan muttered. "I'll go through it like a sixteen-inch shell! Who would have thought I'd end this way!"