The original BB Unknowns do not include
two sightings for this date. However, the the Comprehensive Catalog of
Project Blue Book Unknowns by Brad Sparks does.
568. July 29, 1952. Walker AFB,
Roswell, NM. Four weather observers,
including base weather officer, sighted several high speed discs
through a theodolite. Time not given. (Hynek UFO Rpt. Pages 114-115)
569. July 29, 1952. Los Alamos, NM.
10:00 AM. Several Los Alamos
scientific lab and other witnesses saw a white object moving E-W, about
1.8-degrees/sec angular velocity, with gyration or fluttering motion.
Two jet interceptors from Kirtland AFB arrived about 5 minutes later.
Chasing object W-E, all three leaving contrails. At 10:57 AM, light
brown egg-shaped object with wings was sighted hovering then shot off
to the NW disappearing in three seconds. (Hynek UFO Report. Pages
61-64.
Hynek:
The apparent speed of the discs required the theodolite to be turned at
maximum rate in order to track them, much faster than the rate used for
conventional aircraft flying at high altitudes.
The intelligence officer:
The scientific experience of the weather personnel making these
observations is sufficient to warrant credence in their sightings and
indicates an actual appearance of unidentified flying objects.
