usually however there is provided a particular regulation device which is not subject matter of the present invention and therefore need not here be further considered it would be possible to provide feelers or sensors at different locations of the width of the material web these sensors providing data concerning the moisture profile i e the moisture content of the material web throughout its surface this data can be used as a basis for changing the adjustment devices which then accordingly bring about the change in the moisture content of the processed material web by appropriately positioning the related slide elements 5 of course such slide elements 5 are provided either at all or at the very least at a great number of the nozzle casings 3 or the blow out surfaces 1 in this way it is possible to act upon the material web which is located in the processing machine typically for instance the papermaking machine such as at the drying cylinder thereof additionally there is available the possibility with the aid of a suitable computer or microprocessor to appropriately control the mode of operation of the slide elements the construction of slide elements 5 shown in the drawings only constitute an exemplary embodiment obviously it is possible to use different designs of opening and closing elements 4 it here being mentioned by way of example and not.