Abstract: The invention relates to the measurement of the ovalization of a ferromagnetic pipe.An electromagnetic pickup is moved in a circular path around the pipe, the pickup transmitting signals influenced by the radial distance between the pickup and the pipe. These signals are compared with signals from previous measurements made on a similar pipe to obtain indications of the radial distance between the pickup and the pipe so as to be able to deduce the transverse configuration of the pipe. The pickup is supplied with ac at a frequency of about 700 Hz and the signals from the pickup are compared with previously obtained signals both as to amplitude and phase.The pickup is mounted on a circular slide movable along a circular track supported on a U-shaped collar which is fixed to the pipe.

Abstract: The invention relates to a connector for taking over control of a submerged tool.The connector comprises two parts, a first part mounted on the tool, and a second part mounted on a movable control appliance. The tool is provided with energy distributors and mechanical actuators are mounted on the first connector part for operating the distributors. The control appliance comprises means for controlling the distributors and mechanical control members controlled thereby are mounted on the second connector part for acting on the actuators. A purely mechanical energy transmission is advantageously provided between the two connector parts.