Apparent , or bulk, die lectric constan ts and power factors of chrome and vegetable leather and un ta nned hide are reported for moisture co nte nts up t o 30 perce nt, at temperat ures of 23 C, 0 C, and -70 C over the frequency ran ge 0.75 to 96 kilo cycles . Dielectric constants of fibers determ ined on dr'y material a t 3 kilo cycles and 22 C are : chrome 5.4 ; vegetable 6.4 ; and kan garoo tendon 5.1. Apparent direct-current resistivity decreases from values > 10' 6 ohm-cm when dry to valu es < 10 9 ohm-cm at 30-percent mois ture. Apparent dielectri c co nstant decreases with frequency and te mperature at a ll moisture conte nts, t he frequency depe nde nce increasi ng with moisture co nte nt. Apparent powe r fac tors generally ex hibit similar behavior. At -70 C at high moist ure co ntents, a diffuse absorption ma ximum observed may be due to ice or to perma nent dipo les of collagen which are freed by moist ure. Obser ved behavior is i nterpreted a s probably aris in g fr om a co mbi nation of interfa cial polari zation at s urfaces existing in the fibro us leather a nd dipolar polarization. Res ul ts indicate electri cal measure ments in t his frequency range a re probably not reliable for precise q uant ita t ive moistu re analyses.
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C. E. Weir (1952) studied this question.
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