Metallurgical Examination of Defective and Satisfactory Helmets and Helmet Steel Stock Furnished by the McCord Radiator and Manufacturing Company, Detroit, Michigan

摘要

In the continuation of the investigation of the defects in Hadfield manganese steel which influence the breakage of M1 helmets both during various manufacturing processes and in service, eighty-six samples of defective and satisfactory helmets and helmet steel discs supplied by the McCord Radiator and Manufacturing Company, Detriot, Michigan, were examined at this arsenal.