Locator for magnetic and conducting materials including means for adjusting the relative positions of a pair of sensing coils

Claim 1

A PROBE OR AN INSTRUMENT WHICH DETECTS DISTORTIONS OF THE EARTH''S MAGNETIC FIELD, COMPRISING A RIGID CYLINDRICAL SLEEVE, A RESILIENT TUBE CONCENTRICALLY POSITIONED WITHIN SAID SLEEVE AND SECURELY CONNECTED THERETO AT THE MIDSECTIONS OF SAID TUBE AND SAID SLEEVE, FIRST AND SECOND SENSING COILS MOUNTED IN THE RESILIENT TUBE, SAID COILS BEING NORMALLY COAXIALLY ALIGNED WITHIN THE RESILIENT TUBE AT OPPOSITE ENDS THEREOF, AND FIRST ADJUSTMENT MEANS CONNECTED TO ONE END OF SAID TUBE AND THE ADJACENT END OF THE SAID SLEEVE FOR SELECTIVELY BENDING SAID END OF THE RESILIENT TUBE IN A FIRST PLANE, SECOND AJUSTMENT MEANS CONNECTED TO THE OTHER END OF SAID TUBE AND THE OTHER END OF SAID SLEEVE FOR SELECTIVELY BENDING THAT END OF THE RESILIENT TUBE IN A PLANE PERPENDICULAR TO THE FIRST PLANE, WHEREBY THE RELATIVE POSITIONS OF THE COILS MAY BE SELECTIVELY VARIED.