And, with a touch of the lever, Hal sent the machine forward even faster than before.
For a moment they were in the center of the blinding glare, and then they had passed beyond it. Then Hal spoke.
"I can tell you now what it is," he said.
"What?"
"A lighthouse."
"Lighthouse? What do you mean?"
"Why, that brilliant light we just passed through came from the ground. The powerful flares are used for the guidance of war aviators, or airship men, during the night. They prevent the aviator from getting lost, and denote a safe landing,"
"I see what you mean; but it gave me a scare for a minute."
"And me; at first I thought it was the searchlight of another airship."
"But why should such lighthouses be in use here? I should imagine they would be used only in places of danger."