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r I A descrip t ion is given of an apparatus used for de ter minin g t he thermal conductivities of loose-fill granular materials in t he temperature range 100 to 1,100 °C. The method used in makin g these determinations was t hat of radial heat flow through a hollow cylinder of specimen m aterial contained between a centralceramic core and an outer ceramic shell. The heat flow throu gh the specimen ,,-as determin ed by measurement of t he power inpu t to a heater in t he cent ral cerami c core. The radial tcmperature drop through t he specimen was inferred fr om temperatures measured in the core a nd in t he shell, t hu s avoid in g entirely t he problem s of measurin g a te mperature differen ce wi t hin t he spec imen mater ial. Experimental res ults wit ll an est imated uncertain ty of 3 percen t or less are presented for diatomaceous eart h havin g a dens ity of 0 . 15 g/cm3, and for a luminum oxide powders having dens it ies of 0.40 and 0.44 g/cm3• A discllssion of the lest method is g iven, with attention to possible sources of error. J

A radial-flow apparatus for determining the thermal conductivity of loose-fill insulations to high temperatures