Future Project Mercury astronaut Donald K. "Deke" Slayton 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 until heart beat reaches 180 beats per minute.
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 Major Hal W. Christian Jr., USAF undergoes physical testing at Wright-Patterson Air Force Base, Ohio. Doctors measure candidate's pulse and blood pressure before he undergoes a test on the Tilt Table which is visible on the right hand side of the photo.
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.
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