352 SUMMAKY OF CUKRENT RESEARCHES. 



Heat Treatment of Steel Forcings.* — H. H. Ashdown gives a 

 general description, accompanied by numerous illustrations and photo- 

 micrographs, of the heat treatment of steel in works' practice. The im- 

 portance of pyrometric and metallographic control in ensuring successful 

 results are emphasized : without such control the best steel produced 

 may be hopelessly spoiled. 



* Journ. Inst. Mech. Eng., 1917, pp. 225-35 (14 figs.). 



