As he concluded his conversation and disconnected, Ralph brought his clenched fist down upon the desk. "Magnelium," he muttered between set teeth, "the only machine out in the universe made with Magnelium. Magnelium, my own Magnelium, about which no one in the world knows more than I do. Perhaps the odds are not all with you, Fernand, damn you!" At first thought it might be considered a difficult feat accurately to locate a machine thousands of miles from the earth, speeding in an unknown direction somewhere in the boundless universe. The feat was easy to the scientist. As far back as the year 1800 astronomers accurately measured the distance between the earth and small celestial bodies, but it was not until the year 2659 that Ralph 124C 41+ succeeded in accurately determining the exact location of flyers, in space, beyond the reach of the most powerful telescope. [Illustration] A _pulsating polarized ether wave_, if directed on a metal object can be reflected in the same manner as a light-ray is reflected from a bright surface or from a mirror. The reflection factor, however, varies with different metals. Thus the reflection factor from silver is 1,000 units, the reflection from iron 645, alomagnesium 460, etc. If, therefore, a polarized wave generator were directed toward space, the waves would take a direction as shown in the diagram, provided the parabolic wave reflector was used as shown. By manipulating the entire apparatus like a searchlight, waves would be sent over a large area. Sooner or later these waves would strike a space flyer. A small part of the waves would strike the metal body of the flyer, and these waves would be reflected back to the sending apparatus. Here they would fall on the _Actinoscope_ (see diagram), which records only reflected waves, not direct ones. From the actinoscope the reflection factor is then determined, which shows the kind of metal from which the reflection comes. From the intensity and the elapsed time of the reflected impulses, the distance between the earth and the flyer can then be accurately and quickly calculated. The reflection factor of Magnelium being 1060, Ralph succeeded in locating Fernand's space flyer in less than five hours' search. He found that Fernand's machine at that time was about 400,000 miles distant from the earth and apparently headed in the direction of the planet Venus. A few seconds' calculation showed that he was flying at the rate of about 45,000 miles an hour. This was a great surprise to Ralph and it puzzled him somewhat. He knew that Fernand's machine was capable of making at least 75,000 miles an hour. Ralph reasoned that if he were in Fernand's place, he would speed up the flyer to the utmost. Why was Fernand flying so leisurely? Did he think himself secure? Did he think that nobody could or would follow? Or was he having trouble with the _Anti-Gravitator_?