386 SUMMARY OF CURRENT RESEARCHES. 



Improvements in the Case-hardening Process. — D. Hanson and 

 J. E. HuEST (Iron and Steel Institute Meeting, May, 1919). 



The Manufacture and Working of High-speed Steel.— J. H. 

 Andrew and G. W. Green (Iron and Steel Institute Meeting, May, 

 1919). 



The Molecular Constitutions of High-speed Tool Steels, and 

 their Correlations with Lathe Efficiencies. — J. 0. Arnold and F. 

 Ibbotson (Iron and Steel Institute Meeting, May, 1919). 



