Purported Weight Loss
The interactions of vibration, friction, resonance with the springs of the scale are considered to be the root cause of the apparent weight loss reported by Campbell. Dean's patented devices, and his explanation of how his Drive was supposed to work, were later shown to develop no net weight loss over time and do not violate Newton's Third Law of Motion. However, one version of the actually-demonstrated "Dean Drive", while suspended above the ground, was able to pull a load to itself without itself being pulled toward the load. Another version of the machine was able to apply a force to a hand, without moving—yet when the machine was turned off an equivalent force applied by the hand easily moved the machine. Dr. William O. Davis, who witnessed the latter demonstration, wrote in his notebook about Dean's explanation of how the device worked, "... does not strike me as valid ... For this reason I have decided to undertake a theoretical study of dynamic systems to see if a concept can be evolved which will describe a world in which Dean's Drive can exist and yet where other known facts are not contradicted." He succeeded at devising such a concept, and it was published.
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