DETElîM [NATION OF THE TIIEltMAL CONDUCTIVITY OF MARBLE. -75 



A ciu've \v'(s careftiUy drawn from the numljcrs in the second 

 table, and tlie temperatures corresponding to the numbers in the second 

 coliiinn i)f the first table were carefully interpolated. 



The carve representing' the temperature- variations at the centre 

 is here a'iven. 



Temperature Variation at Centre. 

 Period =3000 Sec; 8th Cycle. 

 Temperature m Centigrade. 



