TABLE 223. 

 CONDUCTIVITY FOR HEAT. 



205 



The coefficient k is the quantity of heat in small calories which is transmitted per second through 

 a plate one centimeter thick per square centimeter of its surface when the difference of tempera- 

 ture between the two faces of the plate is one degree Centigrade. The coefficient k is found to 

 vary with the absolute temperature of the plate, and is expressed approximately by the equation 

 k t ks [i + a (t / )]. k is the resistance at / , the lower temperature of the bracketed pairs 

 in the table, k t that at temperature / and a is a constant. 



* Jaeger and Diesselhorst. 

 SMITHSONIAN TABLES. 



t Herschel, Labour, and Dunn (British Association Committee). 



