Device for measuring the angular orientation of horizontal bores

Device for measuring the angular orientation of horizontal bores, comprising two discrete tubular elements having respective ends axially adjacent one another, a ball-and-socket joint in one of said adjacent ends for connecting said tubular elements with freedom of relative angular displacement and having one rigid extension projecting from said one end into and being anchored in the other of said ends, and a second rigid extension located on the longitudinal center axis of one of said tubular elements and projecting from said joint into the other of said tubular elements, said second rigid extension having a free end portion spaced from said joint, a support member adjacent said free end portion;

• an angle-measuring device carried by one of said support member and said free end portion;
• said device being operative for detecting the occurrence and magnitude of successive relative angular inclinations of the longitudinal center axes of said tubular elements and including a center of gravity oriented pendulum, and optical discrete means operative for optically detecting a continuing record of information provided by said measuring device.