TABLE 196. 

 CONDUCTIVITY FOR HEAT. 



199 



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

 a plate one centimetre thick per square centimetre 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 = k (i + *) In the table k is the value of k t for o C., t the temperature Centigrade, and a 

 a constant. 



* A repetition of Forbes's experiments by Mitchell, under the direction of Tait, shows the conductivity to increase 

 with rise of temperature. (Trans. R. S. E. vol. 33, 1887.) 



:hel, Let 



ipera 

 t Jaeger and Diesselhorst. 



SMITHSONIAN TABLES. 



Herschel, Lebour, and Dunn (British Association Committee). 



