Tables 252 and 253 



TABLE 252. — Thermal Conductivity of Insulators at High Temperatures 

 (See also Table 251 for metals; k in gram-calories per degree centigrade per second across a centimeter cube.) 



273 



Material 



Amorphous carbon . 



Graphite (artificial) . 



Tempera- 

 ture, 

 °C 



37-163 

 170-330 

 240-523 

 283-597 

 100-360 

 100-751 

 100-842 

 100-390 

 100-546 

 100-720 

 100-914 



30-2830 

 2800-3200 



90-110 

 180-120 

 500-700 



.028-. 003 

 .027-. 004 

 .020-. 003 

 .011-. 004 



.089 



.124 



.129 



.338 



• 324 



.306 



.291 



.162 



.002 

 •55--4S 

 •44-- 34 



■3I--22 



Material. 



Erick: Carborundum 



Building 



Terra-cotta 



Fire-clay. . 



Gas-retort . 



Graphite. . 



Magnesia. . 



Silica 



Granite 



Limestone 



Porcelain (Sevres) . . 

 Stoneware mixtures 



References: (1) Hansen, Tr. Am. Electrochem. Soc. 16, 329, 1909; (2) Hering, Tr. Am. Inst. Elect. 

 Eng. 1910; (3) Bui. Soc. Encouragement, in, 879, igog; Electroch. and Met. Ind. 7, 383, 433, 1909; (4) 

 Poole, Phil. Mag. 24, 45, 191 2; see also Clement, Egy, Eng. Exp. Univers. 111. Bull. 36, 1909; Dewey, Pro- 

 gressive Age, 27, 772, 1909; Woolson, Eng. News, 58, 166, 1907, heat transmission by concretes; Richards, 

 Met. and Chem. Eng. n, 575, 1913. The ranges in values under 1 do not depend on variability in ma- 

 terial but on possible errors in method; reduced from values expressed in other units. 



TABLE 253. — Thermal Conductivity of Various Substances 



Substance, temperature. 



Aniline BP 183° C, —160. 



Carbon, gas 



Carbon, graphite 



Carborundum 



Concrete, cinder 



stone 



Diatomaceous earth 



Earth's crust 



Fire-brick 



Fluorite, —190 



Fluorite, o 



Glass: window 



crown, 03:72, —190.. 



crown, 0357;, o 



crown, 03572, 100. . . . 



h'vy flint 0165, —190 



h'vy flint 0165, o. . . . 



h'vy flint oi65, 100. . 



Glycerine, —160 



Granite: 



Ice, —160 



Ice, o 



Iceland spar, —190 



Iceland spar, o 



Lime 



Limestones, calcite \ 



Marbles, dolomite 1 



Mica 



Flagstone J_ to cleavage 



Micaceous 1 1 to cleavage . . . , 



Substance, temperature. 



Naphthalene MP 79° C, —160.... 



Naphthalene MP 79 C, o 



Naphthol — /3, MP 122° C, -160 



Xaphthol, o 



Nitrophenol, MP 114° C. —160. . . 



Nitrophenol, o 



Paraffin MP 54 C, —160 



Paraffin, o 



Porcelain 



Quartz J_ to axis, —190 



" , o 



" , 100 



Quartz 1 1 to axis, o 



Rock salt, o 



Rock salt, 30 



Rubber, vulcanized, —160 



Rubber, o 



Rubber, para 



Sand, white, dry 



Sandstone, dry 



Sawdust 



Slate J_ to cleavage 



Slate 1 1 to cleavage 



Snow, fresh, dens. = o.n 



Snow, old 



Soil, average, sl't moist 



Soil, very dry 



Sulphur, rhombic, o 



Vaseline, 20 



Vulcanite 



References: (1) Lees, Tr. R. S. 1905; (2) Lorenz; (3) Norton; (4) Hutton, Blard; (5) Eucken, Ann. 

 d. Phys., 1911; (6) Herschel, Lebour, Dunn, B. A. Committee, 1879; (7) Jansson, 1904; (8) Melmer, ign; 

 (9) Stefan. 



Smithsonian Tables. 



