Cantilever-type inclinometer

Apparatus for determining the inclination of a well bore comprising a flexible rod having an upper end and a lower end, means in said apparatus for rigidly supporting said upper end of said rod, a target means, means for vertically moving said target means needle point means operatively connected with said lower end of said rod and suspended over said vertically movable target means, means responsive to a predetermined condition for moving said target means relatively towards and against said needle point means, an elongated threaded cylinder mounted on said flexible rod above said needle point means, weight means having a threaded opening therein engaging the threads on said elongated threaded cylinder whereby said weight means can be rotated on said elongated threaded cylinder to move said weight means upwardly or downwardly, said weight means causing bending of said rod by cantilever action when said apparatus is in said well bore and said well bore is inclined with respect to the vertical, and a lock nut means mounted on said elongated threaded cylinder for locking against said weight means to hold said weight means in fixed vertical position on said elongated cylinder.