hereby incorporated by reference herein further adaptive gain controls are generally known in the art and described in bailey controls company technical paper tp81 5 titled 34 adaptive process control using function blocks 34 which publication is also incprorated by reference herein refering now to the drawings fig1 shows a typical boiler with feedwater 2 entering a steam drum 4 passing down the downcomers 6 into the boiler section 8 where the feedwater 2 is converted into a steam and water mixture the steam is separated from the water in the drum 4 and dry saturated steam 10 is sent to the primary superheater 12 the superheated steam from the primary superheater is cooled by the spray attemperator 14 and passes through the secondary superheater 16 the superheated steam 18 then goes to either a turbine process or both there are time delays between the attemperator spray location and its effect on final steam leaving the secondary superheater time lags are also caused by the heat transfer characteristics of the superheater metals and the steam itself fig2 illustrates a typical reaction of superheat steam temperatures to a change in attemperator water flow the size and times will vary depending on boiler design size and load rating thus actual temperatures and water flows are not quantified the time illustrated is typical of a boiler having a main stream flow of about 4 000 000 pound per hour operating at about half load at full load the time response.