590 



eawdon: annealing of bronze 



BECAUSE OF SURFACE OXIDATION THE MEASURED THICKNESSES DO NOT REPRESENT 

 THE TRUE DEPTH TO WHICH THE METAL WAS WORKED. AVERAGE WEIGHT OF 

 SAMPLE, 20 GRAMS 



1 To obtain an approximate quantitative expression of the rate of absorption of the eutectoid, the 

 number of inclusions in the successive microscope fields taken contiguously along a diameter of the 

 sample (magnification lOOX) was counted. On account of the difference in size of the particles, this 

 method is a rough approximation only. 



^ When the dendritic structure appears to have di-sappeared entirely, upon examination under vertical 

 illumination, with oblique illumination it is still to be seen. 



' The thickness of the recrystallized layer was in all cases measured directly by means of a micrometer 

 ocular. 



