NASA Project Mercury astronaut candidate Lt. Hal R. Crandall, USN, undergoes equilibrium and vibration stress test at Wright-Patterson Air Force Base, Ohio. He must keep the chair upright while blind-folded, and the chair vibrates at a high-frequency.
NASA Project Mercury candidate Captain James W. Wood, USAF, undergoes psychological and stress test at Wright-Patterson Air Force Base, Ohio. Doctors measure candidate's pulse and blood pressure before and after a "Flack" test. The subject must blow continuously into a tube to maintain a column of mercury at a specified level for as long as possible.
NASA Project Mercury astronaut candidate Major Hal W. Christian, Jr., USAF, undergoes psychological and stress test at Wright-Patterson Air Force Base, Ohio. Astronaut undergoes a treadmill test. Subject walks at a constant rate on a moving treadmill which is elevated one degree each minute. The test continues till heart beat reaches 180 beats per minute. Subject sits on a stool in between the tests.
NASA Project Mercury candidate Captain James Wayne Wood, USAF, undergoes psychological and stress test at Wright-Patterson Air Force Base, Ohio. Astronaut takes an instrument in his mouth and blows air. Doctor checks his pulse and pressure wearing a stethoscope. Subject's feet dipped in ice water.
NASA Project Mercury astronaut candidate Major Hal W. Christian, Jr., USAF undergoes treadmill test at Wright-Patterson Air Force Base, Ohio. He sits on a stool while doctors take readings from an instrument.
NASA Project Mercury astronaut candidate Captain Donald K. "Deke" Slayton undergoes treadmill test at Wright-Patterson Air Force Base, Ohio.
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