nasm2012-02199.jpg

Ed Collen, a NASA engineer, built this prototype device as a backup for Apollo astronauts in case their primary navigation system failed.
nasm2012-02200.jpg

Ed Collen, a NASA engineer, built this prototype device as a backup for Apollo astronauts in case their primary navigation system failed.
nasm2012-02201.jpg

Ed Collen, a NASA engineer, built this prototype device as a backup for Apollo astronauts in case their primary navigation system failed.
nasm2012-02202.jpg

Ed Collen, a NASA engineer, built this prototype device as a backup for Apollo astronauts in case their primary navigation system failed.