The steady stream of this light was a fixed factor, being held at such a position as would cover the greatest amount of the dam face.
Now, as Sim Gage topped the grade, gravel crunching under his feet, a trifle out of breath with his climb, since the incline itself was a thing of magnificent distances, he saw the searchlight of the power dam begin a performance altogether new in his own experience.
The great shaft of light rose up abruptly to a position vertical, a beam of light reaching up into the sky.

An instant, and it began to swing from side to side.

It swung sharply clear against the bald face of the mountain at the farther end of the dam.

It swept down the canyon itself, or to its first great bend.

It rose again and swept across the dark-fringed summit of the mountains on the hither side of the stream.