Adam and Merrils. 1. 



Fig. I. 



.2 per cent. Carbon Steel, annealed. Mag-nificatidn 5.000 diams. approx. 



K.I Colour Filter. 



Fig. 2. 



1.2 per cent. Carbon Steel Wire. Re-heated at 650° C, showing 



Spheroidised Cementite. Magrnification -|..oco diams. approx. Red Colour 



Filter A, showing- maximum detail. 



Fig. 3. 



900° C, showing- Sorbitic Pearlite. Magnification 3.000 diams. Orange 

 0.85 per cent. Carbon Swedish Steel. No. 5 S.W.G. Rod. Air-cooled from 



Colour Filter G. 



