TM 5-818-1 / AFM 88-3. Chap. 7
Table 4-5. Borehoe Surveying Devices-Continued
a
Device
Measurement Obtained
Primary Use
Visual logging
(Continued)
Downhole camera
Photograph of the side-
Examination of bore-
walls of the borehole
hole conditions,
taken from the bottom
bedding, joints,
of the camera.Several
etc.
feet of hole below de-
vice taken with each
exposure
Borehole television
Image of the sidewalls
Rapid examination of
of the borehole dis-
borehole conditions
played at the time of
as the device is
exposure on a surface
lowered or raised
monitor
Miscellaneous logging
Caliper
Borehole size
Washouts, fractures,
etc., needed for
interpretation of
other logs
Borehole surveyor
Downhole directional
Precise location and
survey
attitude of fea-
tures recorded on
other logging tools
(Sheet 3 of 3)
U. S. Army Corps of Engineers
4-15
Previous Page
