An apparatus for determination of thermal resistance of blankets under conditions similar to those on a bed is described. The reliability and precision of this apparatus is discussed, and its extension to water vapor transfer is mentioned. The effects of relative humidity, use of counterpane, type and construction of blanket, washing, and number of thicknesses are discussed in reference to several possible blanket types suggested for institutional use in Australia. The importance of comfort consideration in selection of blanket type is stressed.
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