Porcelain with Rise of Temperature. 



95 



it was impossible to keep the temperature quite steady 

 during an observation. For comparison with the experi- 

 mental numbers given in column 6, which represents the 

 expansions reduced to unit length at 0°C, column 7 gives 



(7) 



(8) 



(9) 



00) 



















-t 





















































/5Q0 





















y 















/ 

















■■■/ 





y*Qn 















/pon 







•b- 











/ 







A 











y 



/ 







/5QQ 



-1- 









/ 





'£00 



A 





# 







A 



in 

















/ 











■\r ^nn 















'Al 



// 











A 



00 





/ 



/ 







<^n 





/ 







// 











y 





/ 



/ 



/?oo 









A 



/ 







// 











y 





y\{ 



I / 



















/ 



y y 

















y 



>0 















/ 



y 















u 



#\ 

















J 



JT 

















/* 



















100° 200 c 



300 c 



400° 500* 



600° 700° 



800° 



Ordinates: expansion per unit length: unit 10-5. 

 Abscissae : temperatures centigrade. 



(The straight line above the lower curve represents the expansion 

 according to Holborn and Wien's coefficient.) 



