NASA Project Mercury astronaut candidate Major Hal Christian, USAF, undergoes an equilibrium and vibration test at Wright-Patterson Air Force Base, Ohio. Subject seated on a chair which rotates simultaneously on two axes. He maintains the chair on an even keel by means of a control stick with and without vibration, normally and blindfolded.
NASA Project Mercury astronaut candidate Lt. Hal R. Crandall, USN undergoes Flack and Cold Pressor test at Wright-Patterson Air Force Base, Ohio. Subject blows into a tube for a given period of time to support a column of mercury. He also plunges his feet into a tub of ice water. Doctor examines pulse and blood pressure before and during the test.
Prospective NASA Project Mercury astronaut, Harold W Christian undergoes Harvard step and tilt table test at Wright-Patterson Air Force Base, Ohio. Doctor checks subject's pulse and blood pressure. Harold Christian, wearing Converse All Stars high top shoes, steps 20 inches to a platform once every two seconds. After some minutes, when cued by the medical staff watching, he stops stepping and immediately lies on a backward inclined table (for 25 minutes to measure ability of the heart to compensate for body in an unusual position for an extended time). Medical personnel monitor his vital signs as he is on the inclined table.
Prospective NASA Project Mercury astronaut, Captain Thomas R. Bogan, USAF, wearing a helmet and pressure suit undergoes altitude chamber test at Wright-Patterson Air Force Base, Ohio. He enters a room and doctor examines him.
Prospective NASA Project Mercury astronaut, Captain Robert E. Solliday, USMC, wearing a helmet and pressure suit undergoes altitude chamber test at Wright-Patterson Air Force Base, Ohio. He sits on a stool as doctor examines him. Subject enters a room and technicians strap him onto a chair.
Prospective NASA Project Mercury astronaut, Captain Frank D. Frazier, USAF, wearing helmet and pressure suit undergoes altitude chamber test at Wright-Patterson Air Force Base, Ohio. The subject enters a room after the doctor examines him.
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