654877bd_erials_Science_and_Engineering__Significance
[Date] 1900 [Candidate Moment] Johann August Brinell develops a test to estimate the hardness of metals that involves pressing a steel ball or diamond cone against the specimen. [Significance] 
Establishes a reliable (and still commonly used) method to determine the hardness properties of virtually all materials.
Greatest Moments in Materials Science and Engineering
Significance