11:30 a.m. Flight instructor Kenneth Jones out of Elkhorn, Wisconsin, is practicing take-offs and landings with a student near Koshkonong. They watch a disc descending vertically on edge through the alto-cumulus clouds at 6,000 feet, stop at 4,000 feet, assume a horizontal orientation, and fly horizontally for 15 seconds, covering 23 miles at 5,500 mph. At one point it heads straight towards them on a course of about 120°, then stops again (apparently overhead) and disappears. [Eberhart]
Sources:
“‘Flying Saucer’ Seen on Monday By Bob Southey,” Burlington (Wisc.) Free Press, July 10, 1947, p. 1;
https://www.newspapers.com/article/burlington-free-press-burlingtonfreepr/198820099/
Brad Sparks, Blue Books Unknowns Catalogue, Case 30, p. 22;
PURSUE release, p. 21;
https://www.war.gov/medialink/ufo/release_1/65_hs1-834228961_62-hq-83894_section_2.pdf
PURSUE release, p. 115;
https://www.war.gov/medialink/ufo/release_1/65_hs1-834228961_62-hq-83894_serial_130.pdf
Ted Bloecher, Report on the UFO Wave of 1947, Case 574, p. III-11;
Loren E. Gross, The Fifth Horseman of the Apocalypse: UFOs, a History: 1947 July 7th–July 10th, Supplemental Notes, The Author, 2001, p. 9;
