After a preliminary meeting late in November 1952, the panel met on January 12, 1953, to begin their study. The chairman was the late Dr. H. P. Robertson, mathematician and physicist, of the California Institute of Technology at Pasadena. The other members were Dr. Luis W. Alvarez, physicist, of the University of California at Berkeley; Dr. Lloyd V. Berkner, an expert on radio propagation; Dr. Samuel A. Goudsmit, physicist, of Brookhaven National Laboratory; and Dr. Thornton W. Page, astronomer, of Johns Hopkins University, Baltimore. Also present were several officers of the OSI. To avoid possible bias, Air Force officers who had actively worked on UFO cases and civilians who were closely identified with such studies were not asked to attend. The cases studied included all the “classics,” such as the Tremonton and other movies, the Mantell and Gorman affairs, the radar sightings at Washington, D.C., as well as other less well-known reports. One incident that particularly engaged the attention of the panel, and would probably have become a famous classic except that Air Force investigators had kept it a strict secret, was the sighting at Presque Isle Air Force Base in northern Maine. On October 10, 1952, at about 10 P.M. E.S.T., a group of weather observers had noticed a bright-orange object hovering low on the eastern horizon and had set up a theodolite to measure its altitude and bearing. As the glowing unknown slowly rose higher above the horizon and seemed to come closer, it appeared through the telescope of the theodolite as a circular disk accompanied by four flickering green lights, two on each side. Alarmed by this spectacular phenomenon, the observers called the Air Force Base at Limestone, some twenty miles north and east, to ask whether the object was visible there. It was. Setting up a theodolite, the Limestone observers measured the height and bearing, and both groups of observers sent the recorded data to ATIC. [Illustration: _Figure 12a._ The Presque Isle sighting from two stations; the erroneous determination of North at Limestone seems to indicate a nearby UFO.]