BY APPLYING KNOWN THERMAL GRADIENT (E.G., INDICATION OFRESPONSE BY LOCATION):
(under the class definition) Subject matter having an element with a temperature which increases in one direction according to the distance from a reference point so as to determine the relationship between a thermally responsive property and temperature by observation of the spatial distribution of the property.
SEE OR SEARCH THIS CLASS, SUBCLASS:
137, for determination of a temperature distribution, in general.