Mitchell Indiana Site Index
Grissom's Mercury Helmet Gallery


Detail of the helmet's microphone.

The helmet communication system consisted of two independently-wired AIC-10 earphones with sound attenuation cups and two independently-wired AIC-10, newly developed, dynamic, noise-cancelling microphones. The microphones were installed on tracks which allow them to be moved back from the center of the helmet to permit eating and proper placement.

Grissom's Mercury Helmet microphone in Mitchell Indiana
Time picture taken Sun Sep 21 03:22:06 2014
Location picture taken Main Exhibit Gallery
Grissom Memorial
Spring Mill State Park
Mitchell, Indiana
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