A well-logging system wherein a pulsed, narrow [[acoustic]] ([[sonar]]) beam scans the borehole wall in a tight helix as the [[tool]] moves up the borehole. A display of the amplitude of the reflected wave on a cathode ray tube (television screen) is photographed yielding a picture of the borehole wall. The picture is a representation of the wellbore wall as if it were split vertically along magnetic north and laid out flat. Physical discontinuities such as fractures, vugs, etc. are detailed on the [[log]]. The tool may be used for casing inspection, without the magnetic orientation for location of perforations or damage.

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