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Magnetic Tape Analysis
    
  This image, produced by the new NIST forensic tape analysis system, clearly reveals an overdubbing. The new recording is visible from the left bottom of
the image to about 188 millimeters on the distance counter, the large smudge at 216 mm was made by the erase head, and the original recording is visible
starting at about 220 mm.

Download full image

July 20, 2007

Reference Number
                                07EEEL007a

Credit
                                Credit: NIST

Image Type
                    Infographic HEADQUARTERS
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