Method and apparatus locating a buried element.

摘要

After having used a known locator and a known transmitter of an electromagnetic field to find the general line of an element such as a pipe (14), the transmitter is kept activated and a probe is used having a linear coil (32) on its tip (19) which lies with its axis (33) parallel to the length of the tip. The probe includes a display (49,50,51) and the probe is inserted in the ground (13) and rocked to and fro to determine when the coil (32) is in a minimum current condition (51). The probe is inserted further and the same procedure repeated. Eventually the probe contacts the pipe and lies in a radial plane with respect to the pipe.