of some Rocks at High Temperatures. 55 



Table I. 

 The furnace and central wire currents were turned on 

 at 10.9 a.m., the choking-coil being short-circuited. The 

 furnace current was turned off at 10.41 A.M., and turned on 

 again at 12.5 p.m., the coil being in circuit, the core was 

 altered to 20'0 at 1-32 p.m. 









A. 

 515 



V. 

 319 



W. 



B r 



9 V 



E, 



9. 



100a. 



W. 



E 3 - 



A. 



KX103 



K' X 10 3 



A.M. 



11.45 







1559 



16-2 



1747 



143 







803 







12.5 



20-7 



135 



514 



348 





1528 



164 



1719 



141 







787 









1.10 



M 



155 



512 



318 





1588 



171 



1787 



146 







711 









1.32 



20-0 



12-5 



5-11 



3-18 





1620 



17-4 



1822 



149 







704 









2.13 





135 



5-09 



317 





1650 



17-7 



1856 



152 







727 









3.25 



" 



12 



5-08 



3-17 



16-10 



1702 



17-7 



1908 



156 



1*68 



1596 



751 



1418 



3-75 



374 



3.52 



" 



12 



5-07 



316 



1602 



1700 



18-4 



1914 



156 



311 



15-82 



743 



14-02 



3-77 



372 



4.55 



» 



13 



5-06 



316 



15-99 



1723 



18-6 



1940 



158 







751 



1412 



3-74 





E.M.F.s of couples are expressed in microvolts and all 

 temperatures in degrees centigrade. The mean result taken 

 from this day's work is K = 3'73x 10~ 3 at a temperature of 

 157° C. It is evident that the figures in the first colu 



mn 



are all too large as the temperature was rising continuously. 

 Table II. gives the results obtained for limestone arranged 



Table II. 



e. 



KxlO 3 . 



W. 



9. 



KxlO 3 . 



VV. 



9. 



KxlO 3 . 



W. 



91 



4-92 



1260 



160 



4-08 



16-13 



72 



3-96 



8-59 



72 



5-25 



9-82 



302 



3-68 



1627 



243 



332 



16-54 



59 



5-40 



7-55 



320 



366 



1621 



276 



3-25 



16-48 



35 

 239 



5-68 

 4-10 



3-56 

 1375 



186 



3-93 



1519 



227 

 195 



3-40 



3-47 



1629 

 15-76 



370 



331 



15-00 



297 



3-99 



1413 



135 



3-72 



15-92 



135 



3-675 



15-58 



266 



411 



5-55 



92 

 40 



4-06 

 4-56 



13-46 



4-66 



114 

 60 



3-80 

 4-30 



15-12 

 694 



1 361 



345 



8-47 



326 



3655 



9-65 



317 



3-23 



1000 



125 



3-86 



1579 



388 



3-47 



11-42 



157 



3-73 



16-04 



352 



3-20 



15-53 



286 



3-61 



5-73 



77 



4-23 



9-44 



366 



3-17 



16-63 



\ 238 



3-83 



14-83 



315 



3-28 



16-42 









