Good idea there, Mr. M-- suggest we get in touch with Brad Bachelder in GR- when I last visited him in his new location on Plymouth, he gave me a "cook's tour" of the whole shop- and in his special room where he does the color case-hardening, he showed me many fotos and articles, both about the late Dr. Gaddy, and also some written by him. A metallurgist would have a field day with that data for case hardening basic AISI 1018 forging grade mild steel-

"The field is the touchstone of the man"..