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Methods for continuous recording of cutaneous perspiration in a small area of the skin were reported. In the methods, desiccant material provided in an absorption capsule absorbs water vapour from the skin covered with the capsule. The volume of water absorbed in the desiccant was recorded as the increase of weight (gravimetric method) or as the increase of electrical conductance (electrical conductance method) of the desiccant material. In the gravimetric method, the weight increase was converted into movement of light spot on a distant scale, and finally, by means of manual procedure using a sliding apparatus, into unbalanced potential of a bridge circuit. In both methods, the changes of electrical measures were registered directly (integral values) or as differential values using a device for differentiation circuit. Differential values were obtained as spike deflections, height of which represents the rate of water evaporation in 20 seconds. Examples of the results of application on human body were demonstrated for both methods.

DIFFERENTIAL METHOD FOR RECORDING THE RATE OF WATER EVAPORATION IN A SMALL SKIN AREA