| 摘要 |
Apparatus intended to be used with equipment that is inserted into an underground pipe or conduit, which equipment may include a head that is attached to a member such as a hose or cable, which has a wire attached thereto along its length, the wire is connected to a signal generator which provides a signal to be detected by a receiver above ground to provide the location of the member and its depth. The antenna wire is of a highly electrically conductive metal, such as copper. The construction of the wire may be coaxial employing a flexible, yet rigid, spiraled coil steel cable which surrounds the antenna wire.
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