articles in Campbell's magazine was that two other researchers, William O. Davis and G. Harry Stine, visited Dean and witnessed a demonstration. Results of this visit were published in the May 1962 and June 1976 issues of the magazine, the name of which had been changed by Campbell from Astounding to Analog. Davis witnessed a demonstration by Dean, and wrote: "It was the conclusion of both Harry Stine and myself that we had witnessed a real anomaly and that the possibility of fraud in the demonstration was slim." Aerospace researcher Jerry Pournelle — who, like Stine, was also a science fiction writer — pointed out that Stine was well qualified to make a judgment on the device, but that he was more gullible than other persons. Davis's 1962 article was titled, "The Fourth Law of Motion", and described a hypothesis in which Dean's device (and others) could conserve momentum invisibly via "gravitational-inertial radiation". One detail of Davis's hypothesis involved the forces of action and reaction — physical bodies can respond to those forces nonsimultaneously, or "out of phase" with each other. "Detesters, Phasers and Dean Drives", a 1976 article by Davis, reported his tests with Stine, an engineer who built devices to test that aspect of the hypothesis. Stine said they were able to reliably create and reproduce a 3-degree phase angle in a linear system, which was not possible according to ordinary physics. But then they failed to reproduce the effect in a pendulum system, using a rocket-powered ballistic pendulum. The pendulum test would have proved beyond doubt that the Drive worked, but Dean refused to subject the original Dean Drive to a pendulum test. Campbell reported that he had seen the Drive subjected to a pendulum test, but Davis and Stine suspect that he only reported what Dean had told him and had never seen the actual test. Davis says the question can't be settled until the pendulum test is made. Their research was terminated in 1965 when the national economy took a downturn, and was never resumed. The 1976 article was an attempt to get research restarted, but apparently failed. In 1984, physicist Amit Goswami wrote that "Dean's machine made such a splash with readers of science fiction that it is now customary in SF circles to refer to a reactionless drive as a Dean drive." Purported weight loss Dean made a demonstration for a representative of