毛髮ノ強力及ビ伸展性ニ關スル研究 : 第五編(補遺編)
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A. On the moisture absorption of the hair. Hairs haken from the head of the same subject, male, aged 21, were kept in small chambers at nearly 30℃ for 5 hours. The humidity of each chamber was respectively 0, 28, 33, 40, 52, 62, 70, 82, 90, 96 per cent. Then the weight of the hairs of each chamber was measured and the percentage of the moisture absorption was derived from these measurements. 1) The inserted curve is the moisture curve obtained in each case at approximately the same temperature. 2) The curvature resembles those of wool, silk and cotton described by Obermiller. 3) The percentage of the moisture absorption of the hair was larger than that of cotton and smaller than those of wool and silk. 4) As the curve of the percentage of the moisture absorption, between 40-70% humidity, was seen to be nearly a straight line, the author devised a formula applicable to the calculation of the percentage of the moisture absorption between the above stated humidity. That is G=3+0.11H(%). where G means the percentage of the moisture absorption, H means humidity in per cent. B. On the heat conductivity of the hair. A glass tube containing hot water of 76-78℃. was put inside a glass cylinder containing 10 or 20g. hair respectively. From the outside the glass cylinder was put in contact with a water-tank at a constant temperature (13℃). By observing the change of the temperature of the hot water and that of the water-tank during a certain period of time, the constant value "C" was determined according to the following formula:- log(t-t')_0/(t-t')=C.Z., where Z means duration of the observation in minutes, t means temperature of the hot water at certain minutes; t' means temperature of water-tank at certain minutes; (t-t')_0 means difference of temperature in zero minute. It was proved that "C" was in direct proportion to the heat conductivity of the hair. The heat conductivity of the hair, accordingly, could be determined by "C". By calculation "C" was determined as follows:- 1) dried hair 10g. C=0.0175 2) dried hair 20g. C=0,0125 3) hair moistened with vapours (100%) 10g. C=0,0241 4) hair moistened with vapours (100%) 20g. C=0,0208 5) hair oiled with olive oil 10g. C=0,0207 6) hair oiled with olive oil 20g. C=0.0187 Thus the author reached the following conclusion:- 1) The greater the density, the smaller the heat conductivity. 2) The heat conductivity of the dried hair was smaller than that of the moistened hair. 3) The heat conductivity of the dried hair was smaller than that of the oiled hair. 4) The heat conductivity of the oiled hair was smaller than that of the moistened hair.
- 京都府立医科大学の論文
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