Pctavel. 



Phil. Trans., A, vol. 191, 1898, Plate 18. 



Fij*. 2. 



006 



J L ^05 ' ZOO 300 400~^~5Od^~6dd^JOd^~600'' 900 " 1,000^1,100 tfOO 1300 1,400 /.iOO 



Temperature in degrees Centigrade 



i,acxr 



01 



009 

 008 



Fie. 3. 





I* J^ 



eM 



S 



I 



005 



VI 



r e : 



if 



ooe 



001 



TOO 00 MO 400 iOO 600 700 000 300 I.OOO I,IOO I.ZOO 



Temperature in degrees Centigrade. 



700 



