The aim of the invention is a device for coolant cooling in a gas turbine which, with a relatively simple construction and low plant complexity permits a particularly high degree of efficiency in using the heat produced on cooling the coolant from a gas turbine. A face recognition system may semi-automatically label faces andor search for faces in images. In order to be able to automatically replace a tool without using much force and energy, an axially movable closing element is assigned to the pincers elements.