Keywords: Lot-9434-13 Future U.S. Pilots “Fly” Six Miles High Without Leaving Ground. Inside the chamber, when 13,000 feet is reached, an observer gives the students the quiver test. If unsuited for high altitudes, a man’s outstretched hands will quiver violently and his fingernails turn blue. Office of War Information Photograph, April 22-28, 1942. (2016/01/08). Lot-9434-13 Future U.S. Pilots “Fly” Six Miles High Without Leaving Ground. Inside the chamber, when 13,000 feet is reached, an observer gives the students the quiver test. If unsuited for high altitudes, a man’s outstretched hands will quiver violently and his fingernails turn blue. Office of War Information Photograph, April 22-28, 1942. (2016/01/08). |