Electromagnetic induction exploration guide assembly

Claim 1

In an assembly for detecting minerals and metals comprising a first reference electromagnetic oscillator, a second electromagnetic generating oscillator and a signaling output, said second generating oscillator including a search coil extending in a first coil plane and supported on a coil support means and having an electromagnetic field externally extending therefrom and wherein said oscillators and signaling output are firmly supported in a rigid casing, a rigid shaft extends from said casing to said coil support means, a handle is provided on said casing and firmly affixed thereto, said handle and casing and shaft and coil support means firmly and rigidly joined to form a rigid assembly and wherein said search coil is attached to and supported on said coil support means and a search coil guide assembly is attached to said coil support means, said coil guide assembly comprising a continuous curved ground contacting electromagnetically transparent mechanically resiliently deformable wall generally curved in shape of a symmetrical spherical segment with a peripheral lateral circular edge and with an exterior convex surface spaced away from the search coil by a distance transverse to said coil plane and convexly curved relative to the coil, and a support means for said ground contacting wall comprises a flat annular ring with an inner edge thereof firmly yet resiliently attached to the periphery of said curved ground contacting electromagnetically transparent mechanically resiliently deformable ground contacting wall and said support means whereby the exterior surface of said curved ground contacting wall is spaced away from said coil in a direction transverse to the said coil plane, said ground contacting exterior wall surface being located within the field of said coil, said coil having a magnetic field, said field having a depth, said ground contacting surface of said wall being spaced away from the search coil by a distance which is only a minor fraction of the depth of said magnetic field.