Drill-hole direction indicator

Claim 1

DRILL-HOLE DIRECTION INDICATOR MEANS, COMPRISING FIRST APPARATUS INCLUDING A CHASSIS ADAPTED TO BE LOWERED INTO A DRILL HOLE AND TO ASSUME AN ORIENTATION IN ACCORDANCE WITH THE LOCAL ALIGNMENT OF THE DRILL HOLE, AND SECOND APPARATUS COMPRISING REMOTE INDICATOR DISPLAY MEANS ELECTRICALLY CONNECTED TO SAID FIRST APPARATUS, SAID FIRST APPARATUS COMPRISING AN AT LEAST PARTIALLY TRANSPARENT CHAMBER CARRIED BY SAID CHASSIS AND PARTIALLY FILLED WITH A LIQUID AND INCLUDING A CIRCULARLY MARKED FLOAT ELEMENT SUPPORTING A COMPASS MAGNET WHEREBY THE ANGULAR DIRECTION OF SAID FLOAT ELEMENT IS DETERMINED BY EARTH''S MAGNETIC NORTH AND THE ORIENTATION OF SAID FLOAT ELEMENT MAY ALWAYS BE HORIZONTAL, AN ANGLE-IDENTIFYING MARK ON SAID FLOAT ELEMENT, AND A CLOSED-CIRCUIT TELEVISION SYSTEM INCLUDING A SCANNING APPARATUS FIXEDLY CARRIED BY SAID CHASSIS AND SCANNING SAID FLOAT, THE SCANNING ASPECT OF SAID SCANNING APPARATUS BEING PARALLEL TO THAT PART OF SAID CHASSIS WHICH FOLLOWS THE LOCAL ALIGNMENT OF THE DRILL HOLE, SAID REMOTE INDICATOR DISPLAY MEANS BEING CONNECTED TO SAID SCANNING APPARATUS WHEREBY SAID CIRCULARLY MARKED FLOAT WILL APPEAR ELLIPTICALLY MARKED IN THE DISPLAY FOR INCLINATION OF SAID CHASSIS FROM THE VERTICAL, THE DEGREE OF INCLINATION BEING OBSERVEABLE FROM THE RATIO OF MAJOR TO MINOR AXES, AND THE DIRECTION OF INCLINATION BEING RELATED TO THE ANGLE BETWEEN SAID MARK AND AN AXIS OF THE ELLIPSE, SAID DISPLAY MEANS INCLUDING ADJUSTABLE ROTATABLE MEANS FOR ROTATING THE DISPLAY OF SAID ELLIPSE AND MARK WITH RESPECT TO SAID SECOND APPARATUS, WHEREBY THE INSTANTANEOUS NORTH-RELATED DIRECTION OF TILT MAY BE READILY EVALUATED.