The spectacle below them was indescribably beautiful. As far as the eye could see was a broad expanse studded with lights, like a carpet embroidered with diamonds. Thousands of aerial craft, their powerful searchlights sweeping the skies, moved silently through the night, and once in a while an immense transatlantic aerial liner would swish by at a tremendous speed.
Most beautiful of all, as well as wonderful, were the Signalizers. Ralph pointed them out to his guests, saying:
"In the first period of aerial navigation large electric lamps forming figures and letters were placed on housetops, and in open fields that the aerial craft above might better find their destinations. To the traffic flying 5,000 feet or higher such signals were wholly inadequate, as they could not be correctly rea
