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This Bio-Harness Assembly was worn under the Mercury pressure suit and was worn by John Glenn during his historic Friendship 7 flight on February 20, 1962.

The components consisted of an electrocardiograph signal conditioner, an impedance pneumograph signal conditioner and a DC-DC converter. These instruments monitored the physiological functions of the astronaut. The sensor attachment in the helmet was for respiration count.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Country of Origin United States of America Type PERSONAL EQUIPMENT-Medical Astronaut John H. Glenn, Jr.
 Manufacturer Unknown
 Dimensions 3-D (As Displayed): 61 × 3.8 × 1.3cm (24 × 1 1/2 × 1/2 in.)
 Materials Sensors: Rubber, aluminium
Wires: Plastic-coated copper wire
Microphone: aluminium
 Inventory Number A19670189000 Credit Line Transferred from NASA - Manned Spacecraft Center Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
For more information, visit the Smithsonians Terms of Use.