| 摘要 |
An artifact (2) which is being intentionally covered with a material (10) of low magnetic permeability has a permanently magnetic element (14) atop or integral with the artifact. Subsequent to the covering, the artifact is located by passing a compass (16) or compass-like element over the covering material (10) until the magnetic field of the magnetic element (14) associated with the artifact (2) is detected by movement of the compass (16) or compass-like element caused by said magnetic field. The magnetic element may be integral with a cap (12) or plug put upon or attached to the artifact, or the magnetic element may be placed upon or adhesively affixed to the artifact. |
