A gravity orientation device comprises a cylindrical casing, a shaft rotatably mounted in the casing along the longitudinal axis thereof and having pointed ends contacting bearing surfaces located in the ends of the casing, an encoder mounted within the casing and having a fixed portion
A borehole camera monitoring system comprises a camera head assembly adapted to be lowered into a borehole by means of a cable and control unit located above ground for generating a control signal for the operation of the camera. The camera head assembly comprises a fixed portion and a
