At a naval station in the United States this low-pressure chamber is used to test student pilots' fitness for high altitude flying and to accustom qualified pilots to conditions of great height. In this chamber they can "soar" 35,000 feet at a mile a minute without leaving the ground. Centre: Inside the chamber when 18,000 feet is reached an observer gives the student a quiver test. If unsuited to high altitudes a man's outstretched hands will quiver violently and his finger nails turn blue. Below: As the height increases the third man from left is dizzy and faint, while others appear drowsy.

Auckland Star, Volume LXXIII, Issue 168, 18 July 1942, Page 3

At a naval station in the United States this low-pressure chamber is used to test student pilots' fitness for high altitude flying and to accustom qualified pilots to conditions of great height. In this chamber they can "soar" 35,000 feet at a mile a minute without leaving the ground. Centre: Inside the chamber when 18,000 feet is reached an observer gives the student a quiver test. If unsuited to high altitudes a man's outstretched hands will quiver violently and his finger nails turn blue. Below: As the height increases the third man from left is dizzy and faint, while others appear drowsy.