8
position should be marked and the TRANSMITTER moved to
that point. The same procedure can then be followed as de-
scribed above. Using this system the pipe can be followed for
unlimited distances. (The maximum distance between TRANS-
MITTER and RECEIVER will vary with soil conditions and other
factors and may range from several hundred feet under good
conditions down to as little as fifty or so under extremely adverse
conditions.)
PINPOINTING
When two structures, such as gas and water mains,
are fairly close together, care must be exercised in the adjust-
ment of the control so that the unit responds only to the
stronger signal which radiates from the desired structure. Use
of the direct connection system may make it far easier to differ-
entiate between structures under such conditions.
Although the Pipehorn is easy to use, a little training
and practice will increase its effectiveness. Practicing with the
unit over a known main is an effective and practical way to im-
prove one’s skill in its use.
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