. The Bell System technical journal . cessive cycles of exposureto high and low humidities. Our data show—(a) no change occursin the position of the absorption curve for water-boiled cotton duringtwo absorption cycles; (b) identical desorption curves for two differentwater-boiled samples; (c) identical desorption cur^^es for raw cottonin three cycles, as well as a suggestion that the third absorption curve(only one point obtained—at 26 per cent ) coincides with thesecond absorption curve; (d) a reduction in area in the raw cottonhysteresis loop on the second absorption cycle; (e) this redu
. The Bell System technical journal . cessive cycles of exposureto high and low humidities. Our data show—(a) no change occursin the position of the absorption curve for water-boiled cotton duringtwo absorption cycles; (b) identical desorption curves for two differentwater-boiled samples; (c) identical desorption cur^^es for raw cottonin three cycles, as well as a suggestion that the third absorption curve(only one point obtained—at 26 per cent ) coincides with thesecond absorption curve; (d) a reduction in area in the raw cottonhysteresis loop on the second absorption cycle; (e) this reduced areafor the raw cotton differs but little, both in area and location, from thehysteresis loop for the water-boiled cottons. 12 This type of hysteresis loop in the moisture adsorption properties of cotton hasbeen discussed at length by Urquhart and Williams, Jour. Text. Inst., 15, T138, 1924;also Shirley Inst. Mem., 3, 49, 1924. Sheppard and Newsome, Joiir. Phys. Chem., 33, 1819, 1929. ELECTRICAL CONDUCTIVITY OF COTTON 437 30 40 50 60 70 RELATIVE HUMIDITY IN PER CENT Fig. 1—Rekitions between relative humidity and the moisture content and loginsulation resistance of raw cotton at 25° C. 438 BELL SYSTEM TECHNICAL JOURNAL £ ^ ; 2 2 Z 2 !5 O < N S\ s\ — LEGEND — oi FIRST CYCLE ADSORPTION °} FIRST CYCLE DESORPTION ot SECOND CYCLE ADSORPTION oj SECOND CYCLE DESORPTION ^ THIRD CYCLE ADSORPTION • ADSORPTION AFTER REDRY-ING AT I05°C V \ \ \^ ^ i % SLOPE= ^ V i i \ ^ \ \ \ Vj \ \ \ \ K. X k , ^ LOG PER CENT MOISTURE CONTENT Fig. 2—Relation between log of per cent moisture content and log insulation re-sistance of raw cotton at 25° C. ELECTRICAL CONDUCTIVITY OF COTTON 439 LOG PER CENT MOISTURE
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