And thus time wore on.
But thrilling events were in store.
One day the Scorcher rested at the base of the high mountain wall. Frank and Randall had left her for a walk over the green turf.
Randall was an expert geologist, and had spent much time in examining the strata of the region.
Now, as they strolled along, he cast his gaze upward critically along the great rock wall. Suddenly he came to a halt.
“Frank,” he said, “I think I have hit upon a discovery.”
“Eh!” exclaimed the young inventor.
“It is true, and if my theories prove correct, it is a most important one.”
“What is it?”
Randall pointed up to several distinct lines of various heights on the mountain wall.