82 SUMMARY OF CUKRENT RESEARCHES, 



Flakes in Alloy Steel. — Howe, Clayton, Rawdon, Foley, and 

 Laney {IVie Chemical and Metallurgical Engineering^ 1919, 20, No. 5, 

 216). An outline of papers and discussion of this important defect 

 presented at the New York meeting of the American Institute of 

 Mining Engineers. 



G-rain Limits in Heat-treated Alloy Steels. — R. S. Archer {The 

 Iron Age, 1919, 103, No. 6, 366). New etching process which defines 

 the crystals, boundaries, and assists in detecting faulty heat treatment. 



New Light on Transverse Fissures.— G. F. Comstock {The Iron 

 Age, 1919, 103, No. 10, 613). Phosphorus streaks as a cause of such 

 rail defects. How they form and what they are. Effects of reheating 

 the blooms. 



Static, Dynamic and Notch Toughness.— Samuel L, Hott {The 

 Iron Age, 1919, 103, No. 9, 545). Value of the Charpy test in deter- 

 mining ability of steel to resist rupture under notch conditions. Its 

 use in Europe. 



The Metallography of Heat Treatment of Metals used in 

 Aeroplane Construction. II. — F. Grotts [Chemical and Metallurgical 

 Engineering, 1918, 19, 191-196). Investigation of parts made from 

 medium-carbon, high-carbon and chrome-nickel steels. Causes of 

 failure in cam wheels, piston pins and crank shafts. 



