Steel Hardness Specimen Brinell indentation Rockwell B indentation Rockwell B preload indentation Rockwell C indentation Rockwell C preload indentation taken by Jeff Thomas, November 1997
Rockwell B Indention Inside a Brinell Indention taken by Jeff Thomas, November 1997
Rockwell B and C Indentions at 5X taken by Jeff Thomas, November 1997, with a light microscope