R.Soc. Edin. Vol. XXXVIII 



Barton on the Temperature Variation of the Magnetic Permeability of Magnetite. 



Plate II. 



Curve (I). 



Curve (III). 



CALIBRATION OF THERMO-ELECTRIC COUPLE. 



CORRECTIONS TO KICKS. 





200 300 400" 



Temperatures of Magnetite. 



600 C. 



200 800 400' 



Temperatures of Magnetite 



100 C. 200 300 400 500 



Temperatures of Hot Junction. 



600 C. 



