AT 30,000 FEET. SEAFIRES BRING HIGH ALTITUDE FLYING TO THE NAVY. JULY 1943. THE RESULTS OF A TEST TO MEASURE THE EFFECTS OF HIGH ALTITUDE FLYING, WHERE THE PILOT TURNS OFF HIS OXYGEN IN THE TEST CHAMBER AT 30,000 FEET AND CARRIES OUT TESTS SUCH AS WRITING HIS SIGNATURE AT TIMED INTERVALS. - A naval pilot's signatures made during the test

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