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reaction law is found not to apply in an inertialess environment, then rocket or ionic propulsion will be unable to supply translational motion. Some other principle must be found; it might be possible to position the anti-gravity-inertia field, making it more intense in one direction than in another. The object could move horizontally and/or vertically by using an artificially produced directional difference in the strength of the gravitational field of the universe. Hence, although Oberth's objection 1S serious, it is not insurmountable. UFOs are not beyond modern physical theory. Two concepts have been put forward which would explain, in whole or in part, the flight characteristics of these vehicles. However, are there any clues as to their technological, as opposed to their theoretical, basis? Is there any prospect of terrestrial engineering producing a comparable craft? I think we do in fact have such a clue and that it lies in electricity. It seems that the UFOs employed electromagnetic or electrostatic fields. For example, a Russian lineman working on a "dead" telephone line received a shock as a fireball passed over. Clearly this was a case of magnetic induction. A natural bolide could hardly generate sufficient energy to produce induction; we may infer an artificial magnetic field. In many cases, compasses have acted abnormally in the presence of UFOs. Similarly, people have felt their hair stand on end. Again, it is very frequent that you hear reports of interference with automobiles' ignitions in the presence of UFOs. Typically, as the object approaches a car, its ignition system will fail completely. As the object recedes, the auto's motor will start itself. It appears in such cases that the electromagnetic field surrounding the UFO damps the ignition system, but as the object recedes and the field gradient decreases, an induction takes place which starts the motor automatically if the switch has been left on. Finally, at least one case has been reported by the California chemist W. A. Web of the so-called Farraday affect: watching a UFO alternately with the naked eye and through polaroid glasses, Web noticed that concentric rings appeared about the vehicle when he looked through the glasses. It is well known that light passing through a strong electromagnetic field will have its plane of polarization rotated. This seems to have been what was observed. An interesting experiment conducted several years ago by Dr. E.O. Sax] of Tensitron, Inc., Harvard, Mass., suggests an unsuspected relationship between electricity and gravity, and hence inertia. Saxl's experiment, reported first at a meeting of the American Geophysical Union in the spring of 1964 and published in the British journal Nature of July 11, 1964, disclosed the fact that a torque pendulum slowed down in the presence of a high voltage charge. When Saxl's pendulum was placed in an electrified cage, the gravitational constant it measured decreased in value; furthermore, when the charge was increased from 0 to 5000 volts, the pendulum While Sax] is cautious in interpreting his observations (which are not credited by orthodox theory) they seem to indicate a significant relationship between electricity and gravity. It may be that the slowed systematically.