70 Mr. H. II. Poole on Thermal Conductivity and Specific 



accordingly continued, but that temperature could not be 

 exceeded. The results are shown in Table III. in the first 

 three columns. 



Table III. (Granite). 



I - 



e. 



K. 



w. 



105° 



5 68x10-3 



7-657 



87 



5*655 



5-905 



154 



5-50 



12-10 



98 



5-20 



7 265 



346 



' 4-265 



7341 



516 



3-82 



7212 



105 



4-40 



7-330 



413 



3-86 



7-284 



354 



3915 



7-022 



99 



4-37 



7-097 



237 



4-15 



7 981 



395 



3-845 



7-746 



165 



4-28 



7-987 



79 



4-375 



4-607 ; 



199 



4-225 



8-382 1 



318 



3-975 



8'206 



390 



3-85 



8-015 I 



The first four results are very high and decrease con- 

 secutively irrespective of the temperature. Heating to 

 346° C and then to 516° C caused a large drop. The re- 

 mainder of the results are plotted in fig. 4 (small circles), 



Fijr. 4. 



and lie very fairly along the line shown which represents 

 K= (4-60-0-00192 0) x 10" 3 . The values obtained at 

 516° 0. and at 413° 0. lie as shown somewhat above this line : 

 the latter determination was not a very satisfactory one as 

 in it a. was 0°'216 C. per minute. There is no evidence o£ 

 any apparent change of K with W; in fact the close agree- 

 ment of the results at 99° C. and 79° C, in which the values, 

 of W were quite different, is quite satisfactory. 



